What Tog Duvet Do You Need? A Seasonal Guide

Quick answer: For most UK bedrooms kept between 16°C and 19°C, a 7.5-10.5 tog duvet works year-round. Hot sleepers should go lower (summer duvet tog 2.5-4.5), cold sleepers higher (winter duvet tog 12-15). A wool duvet tog adapts naturally to both, making it ideal for couples sharing a bed.

Choosing between togs can feel like guesswork, especially when every retailer seems to recommend something slightly different. This guide breaks down what tog duvet do I need, how tog relates to UK room temperatures, and why natural fillings like British wool behave differently to synthetic alternatives, so you can make a confident, informed choice.

How Do Tog Ratings Work?

A tog, short for Thermal Overall Grade, measures a duvet's thermal resistance, not its weight or thickness. According to Wikipedia's entry on the tog unit, the tog scale was developed in 1946 by F.T. Peirce and W.H. Rees at the Shirley Institute in Manchester, with 1 tog equal to 0.1 m²·K/W of thermal insulation. British duvets are typically sold in steps of 1.5 tog, ranging from around 3.0 (summer) to 16.5 (extra-warm).

It's worth noting that stated tog values are a minimum; actual warmth can be up to 3 tog higher once a cover is added, since trapped air adds insulation. This is part of what makes duvet tog guide advice tricky to generalise: two duvets with the same tog rating can feel quite different depending on fill and construction.

Standard adult comfort ratings, per the same source, are:

Tog Range	Season	Typical Use
1.0-2.5	Minimal	Very hot nights or heatwaves
3.0-4.5	Summer	Warm bedrooms, hot sleepers
7.5-10.5	Spring/Autumn	Average UK bedrooms, year-round
12.0-13.5	Winter	Cooler or draughty bedrooms

Some ranges, including Putnams' British wool duvets, offer a two-duvet combination, joining a lighter and heavier duvet to create a warmer all-season option, much like the 4.5 + 9.0 = 13.5 tog combinations described on Wikipedia.

Matching Duvet Tog to the Season and the Way You Sleep

The right answer to best tog for a duvet depends on two things: your bedroom temperature and how your body regulates heat overnight.

According to the Sleep Foundation, the ideal bedroom temperature for sleep is around 65°F (18.3°C), with most doctors recommending a range of 65-68°F (15.6-20°C). Your core body temperature naturally drops by a degree or two as you fall asleep, and a bedroom or duvet that's too warm can interfere with this process, reducing restorative slow-wave sleep and even REM sleep.

What Tog Duvet Is Best for Summer?

A summer duvet tog of 3.0-4.5 suits most UK bedrooms once temperatures climb. Choose a lower tog if you're a hot sleeper or your room struggles to cool down overnight.

What Tog Duvet Is Best for Winter?

A winter duvet tog of 12.0-13.5 is the standard recommendation for colder months, particularly in older or draughtier UK homes where heat escapes more easily.

Adjusting for Hot and Cold Sleepers

Sleeper Type	Recommended Adjustment
Hot sleepers/night sweats	Drop one tog bracket below the seasonal average; favour breathable natural fills
Cold sleepers	Move up one tog bracket; consider a heavier winter weight
Couples with different preferences	Consider a dual-tog duvet, or a natural wool duvet that adapts to each sleeper

Choose a lower tog if you tend to overheat or share a bed with someone who runs warm. Choose a higher tog if you're consistently cold, live in an older property, or sleep in an unheated room.

See also - Sleeping Through Seasons: Your Guide to Year-Round Comfort

Why Wool Duvets Suit Both Hot and Cold Sleepers

If you share a bed with someone whose temperature preferences clash with yours, the filling matters as much as the tog rating itself.

We have been making wool duvets in Devon since 1979, describes its wool duvet tog range as naturally adapting to each sleeper, helping regulate temperature, wick moisture, and feel cool when warm and warm when cool. These are Putnams' own claims about wool's properties, so it's worth treating them as brand-stated benefits rather than independently verified research findings.

Is a Wool Duvet Warm Enough in Winter?

Yes, for most sleepers. Putnams' winter-weight British wool duvet is rated 11–14 tog, squarely within the standard UK winter recommendation. Its summer-weight equivalent sits at 4-7 tog, a touch warmer than the lightest synthetic summer duvets, but still breathable thanks to the natural fibre.

On the research side, a 2016 sleep study published via Nature and Science of Sleep tested wool versus cotton sleepwear and wool versus polyester bedding at 17°C and 22°C. Participants fell asleep significantly faster in wool sleepwear compared with cotton. Importantly, the same study found no significant bedding effect, wool bedding did not outperform polyester bedding for sleep outcomes in this small trial. So while wool's moisture-wicking properties are well documented for sleepwear, claims about wool duvets specifically should be read as reasonable extrapolation rather than proven fact.

Wool vs Synthetic: A Quick Comparison

Factor	Wool	Synthetic
Moisture wicking	Naturally absorbs and releases moisture	Can trap humidity
Weight for warmth	Often lighter per tog	Can feel heavier at equivalent tog
Allergies	Naturally resistant to dust mites	Good hypoallergenic options available
Care	Air regularly or dry clean	Often machine washable
Sustainability	Renewable, biodegradable	Varies by material

Choose wool if you value natural materials, temperature adaptability, and a lighter overall feel. Choose synthetic if you need frequent machine washing or have specific allergy considerations that call for treated fills.

Choosing the Right Size: Single to Emperor

Getting the size right prevents cold draughts at the edges. Here are Putnams' standard dimensions and current "from" prices for its summer British wool duvet:

Size	Dimensions	From Price (Summer, 4–7 tog)
Single	135cm x 200cm	£131.04
Double	200cm x 200cm	£174.72
King	230cm x 220cm	£196.56
Super King	260cm x 220cm	£218.40
Emperor	290cm x 235cm	£240.24

The winter weight equivalent (11-14 tog) starts from £169.26 for a Single, rising to £262.08 for an Emperor. Prices are correct at the time of writing and may change.

If you and your partner frequently pull the duvet in opposite directions, sizing up by one tier can help; more overhang means fewer cold gaps when someone turns over.

See also - Are Wool Duvets Good For Summer?

Five Things to Check Before Buying

1. Tog rating – match it to your season and sleep temperature, not just the calendar.
2. Fill and cover material – look for certified natural fibres, such as Putnams' 100% traceable British wool with an OEKO-TEX Standard 100 cotton cover.
3. Size – choose based on your mattress, with room to size up for couples.
4. Guarantee and returns – Putnams offers a 2-year guarantee and 30-day returns on its wool duvets.
5. Care instructions – wool duvets generally need airing on a sunny day or dry cleaning, rather than frequent washing.

Finding Your Perfect Duvet

Getting your duvet tog guide right comes down to three things: your bedroom's temperature, your own sleep style, and the filling that suits you best. For couples navigating different preferences, a natural wool duvet—like those in the Putnams British wool duvet range,, offers a way to meet in the middle without compromising on comfort.

If you're ready to upgrade your sleep setup, explore the full Putnams duvet and pillow sets to pair a temperature-regulating wool duvet with a complementary natural pillow.

See also - Beat the Heat - Ultimate Guide for Refreshing Summer Sleep

Frequently Asked Questions

What tog duvet is best for all-year-round use in the UK?
A 7.5–10.5 tog duvet suits most UK bedrooms kept between 16°C and 19°C, according to general UK tog conventions outlined by Wikipedia.

Can two people with different body temperatures share one duvet?
Yes. Options include a dual-tog duvet with different ratings on each side, or a natural wool duvet, which Putnams states adapts to each sleeper's individual warmth needs.

Is a wool duvet warm enough in winter?
Putnams' winter-weight wool duvet is rated 11-14 tog, within the standard UK winter range. Research on wool bedding specifically is limited, though wool sleepwear has been shown to help sleep onset in a small 2016 study.

How much do Putnams wool duvets cost?
Prices start from £131.04 for a Single summer-weight duvet and £169.26 for a Single winter-weight duvet, rising with size up to Emperor. Prices are correct at time of writing.

What size duvet do I need?
Match your duvet size to your mattress, from Single (135cm x 200cm) through to Emperor (290cm x 235cm). Sizing up one tier can reduce cold spots for couples.

How do I care for a wool duvet?
Air it outdoors on a sunny day periodically, or have it dry cleaned. Avoid frequent machine washing, which can affect the natural fill.