Guide to duvet tog ratings

Duvet tog ratings | scooms duvets & bedding

What does 'tog' mean for duvets and what tog duvet should you buy?

The tog rating scale measures the thermal insulation of a duvet, which tells you how warm the duvet will be. The higher the duvet tog rating, the warmer the duvet. So, you might want a 2.5 tog duvet or 4.5 tog duvet for the summer, a 9 tog duvet for spring and autumn and a higher 13.5 tog duvet for the winter.

Your tog rating duvet questions answered:

  1. Duvet tog scale chart
  2. What tog duvet should I buy?
  3. What tog is an all seasons duvet?
  4. Do silk duvets use the duvet tog scale?
  5. What does tog mean for duvets?
  6. What tog duvet should a toddler or child have?
  7. What else do I need to think about when choosing a duvet?





Here is our duvet tog chart so you can quickly find the best duvet tog rating for you.

Summer 2.5 tog or 4.5 tog Lightweight
Spring & Autumn 7 to 10.5 tog Cosy in heated room
Winter 12 to 13.5 tog Very warm
All seasons 4.5 tog + 9 tog Choose your warmth

All scooms duvets come with matching button holes so they can easily be fixed together to create the ideal tog rating for you. Giving you the right combination for any season and perfect temperature regulation!


What tog duvet | scooms duvets & bedding



We often get asked 'What tog duvet do I need'? Whilst there isn’t really a ‘best tog for a duvet' as it is depends on personal preference, we can share our experience and that of our customers.

First, the science. Your duvet should be the right tog rating for the season. Your body temperature needs to decrease slightly before you can fall asleep. A comfortable 18°C/ 65F is the ideal temperature for your bedroom at night.  On the duvet tog scale, a higher tog rating equals a warmer duvet. 

We have found that a 2.5 tog duvet or 4.5 tog duvet is ideal for the summer. If you are a hot sleeper or have night sweats, you may want a 4.5 tog duvet for the cooler months and a 2.5 tog duvet for the warmer summer months.

9 tog duvet is perfect for the spring and autumn months, and if your house is warm a 9 tog duvet will also suit you during the winter. 

If you like to be really warm and cosy in the winter, then a 13.5 tog duvet will be right for you.

One of the most versatile options is an all seasons duvet which is made up of two duvets, a lighter tog duvet plus a warmer tog duvet. We offer three different All season duvet combinations, a 13.5 tog duvet (4.5 tog plus 9 tog), an 11.5 tog duvet (2.5 tog plus 9 tog) and a 7 tog duvet (2.5 tog plus 4.5 tog). Our all seasons duvets come with really easy to use fasteners so that you can fit the two duvets together to create a warmer tog duvet. Choose the perfect warmth for you, whatever the temperature. Comes in a handy material bag so you can store one duvet while you use the other.

Having the right tog duvet is important because if you’re too hot or too cold in bed, you won’t get a good night’s sleep!



  1. What does 10.5 tog duvet mean? If a 9 tog duvet is the average tog rating for the Spring or Autumn, a 10.5 tog duvet would be the highest tog rating we would recommend for those seasons.
  2. What is the tog rating for a winter duvet? The typical tog rating for a winter duvet would be a 9 tog duvet to a 13.5 tog duvet.
  3. What tog is best for a summer tog duvet? A 2.5 tog duvet or 4.5 tog duvet would be ideal for a summer duvet.
  4. What is the best tog for an autumn duvet? We would suggest a 4.5 tog duvet or 9 tog duvet depending on how warm you are while you sleep.
  5. Is a 9 tog duvet warm enough for the winter? Yes, many scooms customers use a 9 tog for the winter. If the temperature gets really cold, you may want an all seasons duvet so that you can combine two duvets to make up a 13.5 tog all seasons duvet.
  6. What tog is an all seasons duvet? An all seasons duvet is made up of two duvets, usually a 4.5 tog duvet and a 9 tog duvet, that can be combined together to make a 13.5 tog duvet.
  7. What is a quilt tog rating? Quilt, comforter and duvet insert are typically US terms for a duvet so a quilt tog rating will be the same as a duvet tog rating.
  8. What’s the highest tog duvet? You can get duvet togs up to a rating of 18 tog. This will feel incredibly warm! Great if you live in a tent in the Arctic! 


All seasons duvet | scooms duvets & bedding



An ‘All seasons duvet’ can be a great choice. Made up of two duvets, one a less insulating lower tog duvet and the other a higher and warmer tog duvet. An all season duvet usually combines a 4.5 tog duvet with a 9 tog duvet that can be easily fitted together to produce 13.5 tog, providing great temperature regulation for any season. We offer three different All season duvet combinations, a 13.5 tog, a 11.5 tog and a 7 tog.

All scooms duvets come with button holes so that you can buy one duvet first and then add another duvet at a later date. (Just email us to request some fasteners).



As silk duvets can’t be measured by tog, they’re measured in grams of silk per square metre (gsm). As a guide, 250gsm filling is similar to a 2-4 tog rating, 400gsm is about a 7-9 tog rating, while 600gsm is equivalent to 10-13 tog.



Tog is a word, not an acronym, so it doesn’t actually stand for anything.  The ‘tog’ or duvet tog scale is a measure of thermal resistance of a specific area (typically a square metre). The Tog rating scale (duvet tog scale) was set up in the 1940s by the Shirley Institute in Manchester to provide an easy to follow scale showing a material’s thermal insulation. This ascending tog scale, starting at a cool 1.5 tog to a very toasty 15 tog, shows how good a duvet is at trapping air and therefore providing warmth. 



As children have smaller bodies, a duvet will trap more air around their body and keep them warmer at a low tog rating.

Toddlers and children, particularly under the age of ten, should use a lightweight single size 4.5 tog Summer duvet throughout the year. If they feel chilly, then add a light blanket rather than swapping to a higher tog duvet.

Babies under 12 months are too young for duvets and pillows due to the risk of overheating and suffocation. If your child is younger than 12 months, you need to ensure that they sleep under a blanket or in a sleeping bag specifically designed for their age.



Tog rating is just one of the 4 things you need to consider when you choose a duvet. The 3 other important duvet elements are:

  • The duvet filling - the material used to fill the duvet such as down or wool.
  • Fill power & weight - fill power measures the volume taken up by the down or feather filling in a duvet and fill weight measures the weight of the filling.
  • How the duvet is made - the construction of a duvet is also important to make sure the filling stays well distributed and doesn’t bunch up leaving part of you rather cold during the night!
Duvet accreditations | scooms duvets & bedding

Other things to look out for would be the standards and accreditations the duvet has. scooms duvets are entirely constructed in one place in Hungary for complete quality control. We’re proud that the scooms duvet is anti allergy, free from synthetic fibres and comes with all the top independent industry certifications:

  • Nomite - anti-allergen standard for house dust mite allergy sufferers. 
  • Oeko-Tex 100 - verifies tested against harmful toxins and chemicals.
  • Downafresh - feather and down hygiene and cleanliness requirements to European standard EN 12935.
  • Responsible Down Standard - ensuring down and feathers come from geese that have been treated well and never suffer from live-plucking; following the chain of custody from farm to product.
  • Guaranteed Hungarian down and feather - single country source; by-product of the food industry.





Also in Duvet tog ratings

4.5 tog Hungarian goose down duvet | scooms
Summer duvet / Lightweight duvet / 4.5 tog duvet

The best summer duvet or lightweight duvet will help you sleep more comfortably during the summer months. Choose 2.5 tog to 4.5 tog for a summer duvet.

Read more →

Bedding size guide


These are standard UK bedding measurements so if you know your mattress size, you can easily work out which duvet size you need. (Width x length.)

UK sizes Duvet size Mattress size
Single 135 x 200cm (53 x 79") 90 x 190cm
Double 200 x 200cm (79 x 79") 135 x 190cm
King 225 x 220cm (89 x 87") 150 x 200cm
Super king 260 x 220cm (102 x 87") 180 x 200cm 

US/CANADA BEDDING SIZES: Approximate matches to UK sizes are US King/UK Super king, US Queen/UK King,  US Full/UK Double and US Twin/UK Single.

EUROPEAN BEDDING SIZES: Each size - Single, Double, King and Grand king - is a little larger than the UK equivalent.

Measure your mattress to see which size bedding you need: our UK v European v US mattress comparison guide.



Young children can overheat so if they are old enough to use a full size bed, we recommend using a single size 4.5 tog duvet.

 Tog rating Season / heat Feel
2.5 tog High summer / hot sleepers Light thermal insulation
4.5 tog Summer Lower thermal insulation
9 tog Spring & Autumn Cosy medium heat
All season 13.5 tog 4.5 tog + 9 tog Very warm
All season 11.5 tog 2.5 tog + 9 tog Warm
All season 7 tog 2.5 tog + 4.5 tog Lower warmth



Our goose down duvets have high 700 fill power. Fill weight is measured in GSM (grams per square metre).

Fill weight (not total duvet weight)
Single All seasons - 788gsm
9 tog - 486gsm 
4.5 tog - 302gsm 
2.5 tog - 220gsm
Double All seasons - 1168gsm
9 tog - 720gsm
4.5 tog - 448gsm
2.5 tog - 320gsm
King All seasons - 1478gsm
9 tog - 911gsm
4.5 tog - 567gsm
2.5 tog - 400gsm
Super king All seasons - 1671gsm
9 tog - 1030gsm
4.5 tog - 641gsm
2.5 tog - 480gsm



Our pillows come in two sizes and provide medium support. (Width x length.)

Standard  50 x 75cm
King 50 x 90cm



Our fitted sheets are deep fit, up to 40cm / 15.7" mattress depth. And our duvet covers fasten with large, easy to use buttons. (Width x length.)

Duvet cover Fitted sheet Flat sheet Pillowcase (pair)
Single 140 x 200cm 90 x 190cm 180 x 275cm
Double 200 x 200cm 135 x 190cm 230 x 275cm 50 x 75cm (Standard)
King 230 x 220cm 150 x 200cm 275 x 275cm 50 x 90cm (King)
Super king 260 x 220cm 180 x 200cm 305 x 275cm

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