The Complete Guide to Duvets and Comforters
The thing you sleep under every night has a bigger effect on your sleep quality than almost any other single purchase you make for your home — yet most people buy duvets and comforters with remarkably little thought, grabbing whatever is on offer without understanding the filling, the warmth rating, or the construction. The result is predictable: too hot in summer, not warm enough in winter, flat and lifeless after a year, or so heavy it feels like sleeping under a sandbag. This guide explains every filling type honestly, demystifies the tog rating system (and its international equivalents), covers the construction methods that determine whether your duvet stays plump or goes lumpy, and helps you choose bedding that genuinely matches how you sleep — not how a label says you should.
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Duvet or Comforter — What Is the Difference?
These terms are used differently depending on where you live, and the distinction is worth understanding because it affects how you use and care for the product.
A duvet (from the French word for "down") is a soft, filled insert designed to be used inside a removable, washable cover — a duvet cover. The duvet itself is typically plain white and is not intended to be used uncovered. When it needs freshening, you wash the cover rather than the entire duvet. This is the standard bedding system throughout Europe, the UK, Australia, and much of the world.
A comforter is a quilted, decorative bedcover designed to be used on its own without a separate cover. Comforters are often patterned or coloured and form part of a coordinated bedding set. They are the traditional top-layer bedding in North America. Because they are used without a cover, comforters need to be washed more frequently than duvets, which means they tend to be made from more washable (usually synthetic) fillings.
In practice, the construction of duvets and comforters is often identical — a fabric shell filled with down, feathers, or synthetic material. The difference lies primarily in how they are used. Many products sold as "comforters" work perfectly well as duvet inserts inside a cover, and some products labelled "duvet inserts" are essentially plain comforters. If you see both terms while shopping, focus on the filling, construction, and warmth rating rather than which label is used.
Understanding Tog Ratings
The tog rating is the standard measure of thermal resistance used for duvets, primarily in the UK and Europe. It tells you how effectively the duvet traps heat — the higher the tog, the warmer the duvet. The scale typically runs from 1 to 15.
1–4.5 tog: Lightweight, suitable for warm summer nights or very warm bedrooms. Provides minimal insulation — essentially a light cover rather than serious warmth.
7–9 tog: Medium weight, suitable for spring, autumn, and temperate bedrooms. A 9 tog duvet is the most versatile single rating and the one many people use for much of the year.
10.5–13.5 tog: Winter weight, suitable for cold bedrooms and people who feel the cold at night. A 10.5 tog is comfortable for most people in a typically heated bedroom during winter. A 13.5 tog is for genuinely cold rooms or cold sleepers.
15 tog: Very warm, only suitable for very cold, unheated bedrooms. Most people will find 15 tog too hot in a centrally heated home.
What tog does not tell you. Tog measures thermal resistance — the ability to prevent heat escaping. It does not measure breathability, moisture management, or the subjective feel of the duvet. Two duvets with the same tog rating but different fillings will feel noticeably different: a down duvet at 10.5 tog will feel light and airy; a synthetic duvet at 10.5 tog will feel heavier and bulkier, because more synthetic material is needed to achieve the same insulation.
Outside the UK. Tog ratings are not universally used. In North America, comforters are more commonly described by weight category (lightweight, medium, all-season, heavy) or by fill power (for down products). In continental Europe, some manufacturers use warmth classes or GSM (grams per square metre) of filling weight. The underlying principle is the same — higher numbers mean more warmth — but the scales differ. When buying internationally, check what measurement system is being used.
Fill Power — What the Numbers Mean
Fill power is a measure of down quality, not warmth directly. It indicates how many cubic inches of space one ounce (approximately 28 grams) of down occupies when allowed to expand fully. Higher fill power means larger, fluffier down clusters that trap more air — and trapped air is what provides insulation.
500–599 fill power: Good quality. Provides adequate warmth but requires more down (and therefore more weight) to achieve the same insulation as higher fill powers.
600–699 fill power: Very good quality. A noticeable improvement in loft and warmth-to-weight ratio. This is the sweet spot for most people who want quality without the premium price of the highest grades.
700–799 fill power: Excellent quality. Light, exceptionally warm, and long-lasting. The down clusters are large and resilient, maintaining their loft over many years.
800+ fill power: Premium quality. The lightest, warmest, and most luxurious down available. Typically sourced from mature geese in cold climates (Hungarian, Siberian, or Canadian). The price reflects the rarity and quality.
The practical takeaway: A higher fill power duvet achieves the same warmth as a lower fill power duvet but with less filling, making it lighter and more comfortable. If you dislike the heavy, weighty feeling of a thick duvet, a high fill power down option gives warmth without bulk. If you prefer the comforting sensation of weight, a lower fill power (or feather-heavy) option, or a wool duvet, provides that deliberately heavier feel.
Fill power only applies to down and down-blend products. Synthetic fillings, wool, silk, and cotton duvets are not measured by fill power.
Natural Fillings
Goose Down
The premium natural filling. Goose down clusters are larger than duck down clusters, which means they trap more air and provide better insulation with less weight. Hungarian goose down and Canadian goose down are the most widely available high-quality sources, though Siberian and Polish goose down are also prized.
A goose down duvet is remarkably light for its warmth, breathable (it regulates temperature throughout the night, reducing overheating), durable (a quality goose down duvet can last ten to fifteen years or more with proper care), and has a luxurious, cloud-like loft that synthetic fillings cannot replicate.
The trade-offs are cost (goose down is the most expensive filling) and care (down duvets should be professionally cleaned or washed carefully, and they take a long time to dry thoroughly).
Duck Down
Similar to goose down in function but with smaller clusters and slightly lower fill power. Duck down is less expensive than goose down and provides good warmth and comfort. For many people, the difference between duck and goose down in everyday use is less dramatic than the price difference might suggest. A well-made duck down duvet at a high fill power can perform very similarly to a moderate goose down product.
Duck down can occasionally carry a faint natural odour that goose down does not, because ducks are omnivores while geese are herbivores. Quality processing eliminates most of this, but it is worth noting.
Feather and Down Blends
Many duvets combine down with feathers. Down provides the insulation; feathers add weight, structure, and reduce cost. The ratio matters: a duvet labelled "90% down / 10% feather" is predominantly a down duvet with a small amount of feather for body. A "50/50 blend" or "feather and down" product will be heavier, less lofty, and less insulating per unit of weight than a high-down-content product.
Feathers have quills that can occasionally poke through the casing fabric. Higher-quality casings with a tighter weave prevent this, but it is a characteristic of feather-containing products that pure down products largely avoid.
Wool
Wool-filled duvets are excellent temperature regulators — wool naturally wicks moisture away from the body and releases it into the air, keeping you warm when it is cold and cool when it is warm. This makes wool one of the best fillings for people who fluctuate between feeling too hot and too cold during the night, or for couples who sleep at different temperatures.
Wool duvets have a flatter, heavier profile than down duvets — more like a substantial blanket than a puffy cloud. They are naturally hypoallergenic and resistant to dust mites. Wool duvets are not measured by tog in the same way as down and synthetic products; instead, their warmth is described by GSM (grams per square metre) of filling or by seasonal designation.
The main limitation is that wool duvets cannot be machine washed at home in most cases — they typically require specialist cleaning or careful spot treatment.
Silk
Silk-filled duvets are lightweight, naturally hypoallergenic, and excellent at temperature regulation. They have a smooth, flat drape rather than the lofted puffiness of down, which some sleepers prefer. Silk is one of the thinnest natural insulators, making silk duvets ideal for warmer climates or for layering.
Silk duvets are expensive and require careful handling — most are dry-clean only or require specialist washing. They are a premium, niche choice rather than a mainstream option.
Cotton
Cotton-filled duvets are flat, heavy, and breathable. They suit warm climates and people who prefer sleeping under something with substance but without the insulating intensity of down or wool. Cotton duvets are machine washable and hypoallergenic but do not provide significant warmth, making them unsuitable as a sole winter duvet in cooler climates.
Synthetic Fillings
Synthetic duvets are filled with polyester fibres engineered to mimic some of the properties of natural down. They come in two main types:
Hollowfibre uses thicker, hollow polyester strands that trap air for insulation. It creates a lofty, plump duvet that feels substantial and warm. Hollowfibre duvets are the most common budget option and are widely available.
Microfibre uses much finer polyester strands that create a softer, silkier feel — closer to the sensation of down than hollowfibre. Microfibre duvets are typically more expensive than hollowfibre but still significantly cheaper than natural down.
The honest comparison with natural fillings. Synthetic duvets are cheaper, easier to wash (most are fully machine washable and tumble-dryable), and genuinely hypoallergenic. However, they are less breathable than natural fillings — they trap moisture rather than wicking it away, which can lead to overheating and a clammy feeling during the night. They are also less durable: synthetic fillings compress and lose their loft faster than down, typically needing replacement every three to five years, compared to ten or more years for quality down. And because synthetic fillings are made from polyester (a form of plastic), they release microplastics during washing and are not biodegradable at end of life — an environmental consideration that is increasingly relevant.
When synthetic is the right choice: For children's bedding (frequently washed, cost-effective to replace), for guest bedrooms (lower investment for occasional use), for anyone with a genuine allergy to down or feather (though genuine down allergies are rarer than commonly assumed — see the allergies section below), and for anyone on a limited budget who needs a warm, functional duvet without the investment of natural filling.
How Duvets Are Constructed
The way a duvet is assembled determines whether the filling stays evenly distributed or migrates to the corners, whether it reaches its full loft, and whether cold spots develop.
Baffle box construction is the highest quality method. Thin walls of fabric (baffles) are sewn perpendicularly between the top and bottom layers of the duvet shell, creating three-dimensional boxes that hold the filling in place while allowing it to expand to its full loft. The filling cannot migrate from one box to another, so the warmth distribution remains even over the entire surface. Baffle box construction is standard on premium down duvets and is the most durable method.
Sewn-through (box stitch) construction sews the top and bottom layers of the shell directly together in a grid pattern, creating flat pockets. This is simpler and cheaper to manufacture than baffle box, but it compresses the filling at the stitch lines, creating thin spots where heat can escape. For summer-weight and lightweight duvets this is perfectly adequate. For winter-weight duvets intended to provide serious warmth, baffle box is noticeably superior.
Channel construction creates long, parallel tubes running the width or length of the duvet rather than individual boxes. This allows the filling to move within each channel, which can lead to uneven distribution if the duvet is not shaken out regularly.
Cassette construction is a variation of baffle box with very precisely measured compartments, sometimes with different fill weights in different zones (more filling in the centre, less at the edges). This is a feature of some premium European duvets.
What to look for: For any duvet intended as your primary winter bedding, baffle box construction is worth the additional cost. For summer duvets and lightweight toppers, sewn-through construction is perfectly adequate.
The Casing Matters More Than You Think
The outer fabric of the duvet — called the casing, shell, or ticking — serves several important functions beyond simply holding the filling inside.
Downproofing. A tightly woven casing prevents down and feather fillings from poking through the fabric. The thread count (number of threads per square inch or square centimetre) of the casing is the main indicator of downproofing quality. Higher thread counts produce a tighter weave that keeps filling inside and dust mites outside. For down duvets, a minimum thread count of 233 is standard; premium duvets use 300+ thread count casings.
Breathability. A cotton casing breathes, allowing moisture to pass through and preventing the clammy sensation that can occur with synthetic or polycotton casings. One hundred percent cotton is the best casing material for comfort and temperature regulation.
Softness and noise. Poor-quality casings can feel stiff or make a rustling noise when you move in bed. A well-finished cotton casing is soft and quiet. Polycotton blends are cheaper but less breathable.
Durability. The casing takes the physical wear — friction from duvet covers, compression during storage, stress during washing. A durable casing extends the life of the entire duvet.
Choosing the Right Warmth for You
The correct warmth level depends not just on the season but on your personal thermoregulation, your bedroom temperature, and whether you share a bed.
Your bedroom temperature is the single biggest variable. A well-insulated, centrally heated bedroom at 18–21°C (64–70°F) needs a lower tog than an unheated or poorly insulated room at 12–15°C (54–59°F). Most duvet warmth guides assume a moderately heated bedroom.
Personal thermoregulation. Some people sleep hot; others sleep cold. This is physiological and has nothing to do with toughness or preference — it is simply how your body works. If you consistently throw off covers in the night, you run warm and need a lower tog. If you add extra blankets, you run cold and need a higher tog.
Sharing a bed. Two bodies generate more heat than one. Couples often find they need a lower tog than either person would choose sleeping alone. If one partner sleeps significantly hotter or cooler than the other, two single duvets on a double bed (sometimes called the Scandinavian method) solves the problem permanently — each person has their preferred warmth without compromise.
A practical starting point: If you have never thought carefully about duvet warmth before, a 10.5 tog down duvet or a medium-weight synthetic duvet is a reasonable starting point for a moderately heated bedroom in a temperate climate. Adjust from there based on experience.
All-Seasons Duvets — Are They Worth It?
An all-seasons duvet is actually two separate duvets (typically a lightweight 4.5 tog and a medium 9 tog) that can be fastened together with buttons, poppers, or ties to create a combined winter-weight duvet (13.5 tog). Used separately, each covers a different part of the year.
The advantages are real: You get three warmth options from two duvets, adapting through the seasons without buying three separate products. The total cost is typically less than buying three individual duvets, and storage is simplified.
The limitations are also real. When the two duvets are fastened together, they can shift against each other and feel less unified than a single duvet of the same weight. The fastening points are limited (usually corners and edges), which means the centres of the two layers can separate during the night. And if both duvets are stored for months, they need proper airing before reuse to prevent mustiness.
For most people, an all-seasons duvet is a practical, cost-effective choice. If you are particular about your sleep comfort and willing to invest more, a single-piece duvet at your preferred warmth level for each season will feel more cohesive.
Allergies and Hypoallergenic Claims
This is an area where marketing claims frequently outrun the science.
The most common bedroom allergy is to dust mites, not to down or feather. Dust mites thrive in warm, damp conditions and feed on dead skin cells. They colonise any bedding — natural or synthetic — that provides these conditions. The belief that synthetic bedding is inherently better for allergy sufferers than natural bedding is not well supported by evidence. In fact, some research suggests that synthetic duvets harbour more dust mites than down duvets, because the tightly woven casings required for downproofing act as a natural barrier against dust mites, and natural fillings are more breathable (less damp), creating a less hospitable environment for mites.
Genuine down or feather allergies exist but are less common than assumed. If you have a confirmed allergy to down or feather (diagnosed by an allergist), you should avoid these fillings. But many people who believe they are allergic to down are actually reacting to dust mites in poorly maintained bedding, or to chemicals used in cheap processing. Quality down that has been properly washed and certified (look for the Nomite mark, which certifies suitability for dust mite allergy sufferers) is suitable for most people with dust mite sensitivities.
Wool and silk are naturally resistant to dust mites and are genuinely hypoallergenic options for people with sensitivities.
"Anti-allergy" and "hypoallergenic" labels on synthetic duvets mean the filling itself does not trigger allergies — which is true of polyester by nature. These labels do not mean the duvet is resistant to dust mite colonisation. Regular washing at 60°C (140°F) is the most effective way to manage dust mites in any bedding, natural or synthetic.
Ethical Sourcing of Down and Feather
If you choose a down or feather duvet, the ethical sourcing of the filling is worth considering. Down and feathers are a byproduct of the poultry industry, but practices vary widely.
The Responsible Down Standard (RDS) is an independent, global certification that traces down from source to finished product, ensuring that birds are not subjected to unnecessary harm, live plucking, or force-feeding. Look for the RDS logo on products and packaging.
The Downafresh mark certifies that down has been hygienically processed and is clean and safe to use.
Traceable supply chains — where the manufacturer can identify the farms or cooperatives that supplied the down — are a positive indicator of responsible sourcing.
If ethical sourcing is a priority and you prefer to avoid animal-derived fillings entirely, wool (from welfare-certified farms), silk, cotton, and synthetic fillings are all available alternatives.
Sizing — Getting It Right
Duvet and comforter sizes are not universal — they differ between countries and sometimes between manufacturers within the same country. Always check the actual dimensions (in centimetres or inches) rather than relying on the size name.
A common tip: Consider going one size larger than your bed, especially if you share. A king-size duvet on a double bed (or a super king on a king bed) provides more generous coverage and reduces the problem of one person inadvertently pulling the duvet off the other. The additional fabric drapes further down the sides of the bed, which also improves the appearance when the bed is made.
Duvet covers must match the duvet size. This sounds obvious but is a surprisingly common mistake — a king-size duvet stuffed into a double cover bunches and does not distribute properly. Check both dimensions before purchasing.
Caring for Your Duvet
Proper care significantly extends the life and performance of any duvet.
Use a duvet cover at all times. This protects the duvet from body oils, sweat, stains, and general wear. Wash the cover regularly — every one to two weeks is ideal.
Air your duvet regularly. Throw it back from the bed each morning and leave it exposed to air for at least thirty minutes. This allows moisture absorbed during the night to evaporate, keeping the filling dry and reducing the conditions that dust mites favour.
Shake and fluff your duvet. A quick shake when making the bed redistributes the filling and maintains loft.
Washing frequency depends on filling type. Synthetic duvets can be machine washed every three to six months. Down and feather duvets need washing less frequently — once or twice per year is typically sufficient, as the duvet cover takes the daily wear. Wool and silk duvets should be professionally cleaned unless the manufacturer's care label specifically permits home washing.
Washing down duvets. Use a large-capacity machine (domestic machines may be too small for a double or king duvet — a launderette machine is often better). Use a mild, low-sudsing detergent — ideally one designed for down. Wash on a gentle cycle at 40°C (104°F) unless the care label specifies otherwise. Crucially, dry the duvet thoroughly in a tumble dryer on a low heat setting. This may take several cycles. Adding clean tennis balls or dryer balls to the dryer helps break up clumps and restore loft. A duvet that is put away damp will develop mildew, odour, and clumping — if in doubt, dry it for longer.
Storage. Store clean, thoroughly dry duvets in a breathable cotton bag or the bag they came in. Do not compress them into vacuum storage bags for extended periods — this crushes the filling (especially down) and can permanently reduce loft.
When to Replace a Duvet
Synthetic duvets: Replace every three to five years. Synthetic fillings compress and lose their insulating ability over time, and no amount of washing or fluffing will restore them.
Down and feather duvets: A quality down duvet can last ten to fifteen years with proper care. Replace when it feels flat, has lost significant loft, or when the filling has clumped permanently despite washing and fluffing.
Wool duvets: With proper care, wool duvets can last ten years or more. Replace when the filling feels thin, lumpy, or no longer provides adequate warmth.
Signs it is time to replace any duvet: persistent flat spots that do not recover with shaking, visible clumping or migration of filling, a noticeable decline in warmth despite no change in room temperature, lingering odour that survives washing, or a casing that is worn, thin, or allowing filling to escape.
Duvet Filling Comparison
| Feature | Goose Down | Duck Down | Feather & Down Blend | Synthetic (Hollowfibre/Microfibre) | Wool | Silk |
|---|---|---|---|---|---|---|
| Warmth-to-weight ratio | Excellent | Very good | Good | Moderate | Good | Good |
| Breathability | Excellent | Excellent | Good | Poor to moderate | Excellent | Very good |
| Temperature regulation | Very good | Very good | Good | Poor | Excellent | Very good |
| Loft and puffiness | High | High | Moderate to high | Moderate to high | Low (flat, quilted feel) | Low (flat, smooth drape) |
| Durability (years) | 10–15+ | 8–12 | 5–10 | 3–5 | 10+ | 8–10 |
| Washability at home | With care (large machine, gentle cycle) | With care | With care | Easy (machine washable) | Usually professional clean | Usually professional clean |
| Hypoallergenic? | Possible allergy to down (rare); tightly woven casing resists dust mites | Same as goose down | Feather quills can irritate; less dust-mite resistant than pure down | Filling is non-allergenic; less breathable may encourage mites | Naturally hypoallergenic | Naturally hypoallergenic |
| Environmental impact | Biodegradable; byproduct of food industry; ethical sourcing important | Same as goose | Same as goose | Polyester (plastic); non-biodegradable; microplastic release during washing | Biodegradable; renewable | Biodegradable; renewable |
| Weight on body | Very light | Light | Moderate | Moderate to heavy | Moderate to heavy | Light |
Common Mistakes Buyers Make
Choosing based on tog alone without considering filling type. Two duvets at 10.5 tog can feel entirely different depending on the filling. A 10.5 tog down duvet is light and breathable; a 10.5 tog synthetic duvet is heavier and less breathable. Tog tells you the warmth level but not the sleeping experience.
Buying too high a tog for a heated bedroom. Most centrally heated bedrooms in temperate climates do not need a 13.5 or 15 tog duvet. A 10.5 tog — or even a 9 tog with good down filling — is often more comfortable because it provides warmth without overheating. Overheating is as disruptive to sleep as being too cold.
Assuming synthetic is always better for allergies. The most common bedroom allergen is the dust mite, and dust mites colonise synthetic bedding as readily as natural bedding. In some cases, the tightly woven casings on quality down duvets provide better protection. If allergies are a concern, focus on regular washing, breathable fillings, and certified allergen-barrier casings rather than defaulting to synthetic.
Ignoring the casing material. A cheap polycotton casing on an expensive filling undermines the breathability and comfort of the entire duvet. Look for 100% cotton casings with a thread count of 233 or higher for down products.
Buying too small. A duvet that only just covers the mattress leaves the person at the edge of the bed exposed. Sizing up one step (a king duvet on a double bed) is a simple improvement that costs little but improves comfort significantly, especially for couples.
Not drying a down duvet thoroughly after washing. Down that retains moisture clumps, loses its loft, and develops mildew. This is the single most common way to ruin an expensive down duvet. If you wash it at home, commit to drying it completely — even if that means multiple dryer cycles over several hours.
Storing duvets in vacuum bags. Compression is the enemy of loft. Vacuum-packing a down duvet for months can permanently flatten the clusters. Use a breathable cotton storage bag instead.
Expecting a cheap synthetic duvet to last as long as down. Synthetic fillings are designed to be affordable and replaceable. They serve this purpose well. They are not designed to last a decade. Budget accordingly.
Pre-Purchase Checklist
1. Do you sleep hot, cold, or neutral? This determines the warmth rating that will keep you comfortable without overheating.
2. What is your bedroom temperature at night? Heated rooms need lower tog ratings than unheated ones.
3. Do you share a bed? If your partner sleeps at a different temperature, consider two single duvets or a dual-tog option.
4. Do you prefer a light, airy feel or a substantial, weighted feel? Down provides lightness; wool and feather blends provide weight.
5. Do you have a confirmed allergy to down, feather, or wool? If not, do not rule out natural fillings based on assumption — they may actually perform better for dust mite sensitivity.
6. What is your budget — and your expected replacement timeline? A quality down duvet costs more upfront but lasts three to five times longer than a synthetic duvet.
7. How will you wash the duvet? If you need easy home washing, synthetic is the simplest option. Down requires more care but needs less frequent washing.
8. Does the duvet have baffle box construction (for winter weight) or sewn-through (acceptable for lighter weights)?
9. What is the casing made from? Prioritise 100% cotton.
10. For down products, what is the fill power? Higher fill power means lighter weight for the same warmth.
11. Is the down ethically sourced? Look for Responsible Down Standard (RDS) certification.
12. Have you checked the actual dimensions against your bed size and duvet covers? Name sizes vary between manufacturers and countries.
13. Does the duvet have corner ties or loops? These keep the duvet in place inside its cover and prevent bunching.
14. Have you considered an all-seasons option if you want versatility without buying three separate duvets?
Why Buying Through Amazon Makes Sense
Duvets are a category where filling type, fill power, tog rating, casing material, and construction method all meaningfully affect the product you receive. Amazon's product listings typically provide these specifications in detail, and the customer question-and-answer sections frequently surface practical information that is difficult to assess before purchase: actual weight, loft thickness, whether the filling shifts, and how the duvet performs after washing. Customer photographs showing the duvet on a real bed — rather than in a styled marketing image — are particularly useful for judging loft and size. The ability to compare natural and synthetic options across a wide range of fills and warmth ratings in a single session helps you make an informed choice.
Amazon Marketplace Protections
Amazon's A-to-Z Guarantee protects purchases made through the marketplace, covering delivery issues and items that do not match their description. If a duvet arrives damaged, with filling that does not match the advertised type, or with a warmth rating that is clearly inaccurate, you are covered by Amazon's returns and refund process.
Consumer protection legislation in both the United Kingdom and the United States provides additional statutory rights for goods that are faulty, not as described, or not fit for purpose. These rights exist alongside Amazon's own policies.
Amazon Renewed offers refurbished bedding items, though for duvets — which are personal hygiene products that absorb body moisture over time — buying new is generally preferable unless the renewed product is certified unused or reconditioned to hygiene standards.
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