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Best Duvet Tog for Winter
10.5 tog for a heated bedroom. 13.5 tog for a cold house. 15 tog is a spare room with no radiator. Two lighter inserts beat one furnace.
Updated 27 Aug 2026 · 6 min read · best duvet tog for winter
Match tog to the room, not the month
Central heating at 18–19C: 10.5 tog and a percale or sateen cover is enough for most people. A Victorian bedroom with single glazing and 12C at 6am: 13.5, or 4.5 buttoned to 9.0 so you can unbutton in a thaw. 15 tog plus a 3000 GSM-feeling comforter-style cover is how you wake wet.
Hot sleeper in a cold room: 10.5 and socks, not 15 tog. Cold sleeper in a heated room: 13.5 is luxury, not a requirement.
| Room at 3am | Start here | If you still wake cold |
|---|---|---|
| 18–20C | 10.5 tog | 13.5, or a wool layer |
| 15–17C | 13.5 tog | 4.5 + 9.0 buttoned |
| 12–14C | 13.5–15 tog | Heating, not more tog |
| Below 12C | 15 tog is a plaster | Insulate; a duvet is not a wall |
Fill that holds loft in January
Down, 650–800 fill power, baffled boxes not cheap sewn-through: loft is warmth. Wool 13.5 tog is heavier and handles damp UK air. Polyester 13.5 is $60–$100, bulky, and fine if you wash it more — see how to wash a duvet. Weight comparisons sit in duvet insert vs comforter weight.
Do not trap yourself in one object
A single 15 tog insert is a storage problem from April to October. Two inserts that button (4.5 and 9.0, or 4.5 and 10.5) give you three settings and a summer half you will actually use. That is the grown-up winter purchase, not a bigger number.
Questions, answered
- Is 10.5 tog enough in winter?
- In a heated bedroom, yes, for most people. If you photograph your breath in bed, no.
- Down or wool for a damp cold house?
- Wool tolerates ambient humidity better. Down wants a dry cover and a dry room. Either beats a clammy polyester brick if the tog is honest.
- Can I add a blanket instead of a higher tog?
- Yes. A 200–400 GSM wool blanket over 10.5 tog is more adjustable than jumping to 15.
