What Tog Duvet to Get? | Match Warmth To Your Room

Choosing a duvet feels like a gamble until you understand tog. Tog measures a duvet’s thermal insulation — the higher the number, the warmer it keeps you. The right pick depends less on the calendar and more on your bedroom’s actual temperature and whether you run hot or cold at night. Get it right and you’ll stop waking up sweaty or shivering.

What Tog Ratings Actually Mean

Tog is a standard unit of thermal resistance. A 1.0–4.5 tog duvet is light and breathable for warm nights, while a 12–15 tog duvet traps serious heat for cold bedrooms. Most manufacturers label these bands as summer, spring/fall, and winter weights.

A common misconception is that a thicker duvet is automatically warmer. Tog measures insulation, not thickness or weight. A well-made 10.5 tog duvet can be lighter than a lumpy 7.5 tog one while keeping you warmer.

Here is the standard seasonal rule of thumb:

• Summer: 1.0–4.5 tog
• Spring and fall: 7.0–10.5 tog
• Winter: 12.0–15.0 tog

Match Tog To Room Temperature

Seasonal labels are a starting point, but your bedroom’s temperature is the real deciding factor. One current guide maps tog ratings directly to room temperature, which is the most reliable way to choose:

If your bedroom sits in the middle band most of the year, a 10.5 tog duvet is the most versatile choice, according to Simba Sleep’s tog guide. It works well in mild conditions and layers nicely under a blanket when temperatures drop.

Choosing By Body Temperature

Room temperature matters, but your own body runs the show. Hot sleepers should drop one tog band below the room-temperature recommendation, while cold sleepers should move up a band. A warm bedroom with a 12 tog duvet is a recipe for night sweats.

If you want flexibility without buying multiple duvets, consider an all-season approach: a 4.5 tog duvet for summer, a 10.5 tog for winter, or a single 10.5 tog that works year-round with a blanket added in cold months. For a breathable natural option, our roundup of the best cotton duvets covers materials that regulate temperature well.

The Independent’s duvet tog guide recommends checking the tog label before buying, since visual thickness is a poor predictor of warmth.

Special Guidance For Babies And Children

Children’s tog needs differ from adults, and safety matters more than warmth. For toddlers aged 1–3 years, a light 3–4.5 tog duvet is appropriate, and children over 3 may use 4.5–9 tog depending on the room.

If you choose this route, double-check your child’s own temperature by feeling their chest or back rather than their hands or feet, which are naturally cooler. Keep bedrooms at a consistent temperature and avoid over-bundling children in high-tog bedding.

FAQs

Is a 13.5 tog duvet too warm for most people?

For most adults in a typical heated bedroom, yes. A 13.5 tog duvet suits cold rooms (12–15°C / 54–59°F) or people who run very cold at night. In a normal 18°C room, it will likely cause overheating. Check your room temperature and consider your own body heat before choosing this weight.

Can I use a 10.5 tog duvet all year round?

Yes. A 10.5 tog duvet is widely considered the most versatile all-year option. In summer, it works in air-conditioned or cooler rooms; in winter, add a thin blanket or throw for extra warmth. This single-duvet approach saves money and storage space compared to buying separate summer and winter weights.

What tog duvet do hotels use?

Most hotels use duvets between 10.5 and 13.5 tog. The higher weight gives a cozy feel, but hotels keep rooms cool (around 18–20°C / 64–68°F), so guests rarely overheat. If you want that hotel feel at home, match your duvet to your thermostat, not to what hotels advertise.