Does the temperature outside impact my choice of tog?

The outside temperature is less relevant to your choice of tog than the temperature of your bedroom. It might be -5°C and blowing a gale outside, but if your heating is on full, you may not need anything warmer than a 9.0 tog duvet.

If you're concerned, invest in a simple thermometer to check the temperature of your bedroom. You should be aiming for a night-time temperature of between 16°C and 18°C. Anything warmer than 24°C will make you feel restless and unable to drop off. A temperature lower than 12°C will make it difficult to nod off.

Be guided by your preferences, but we'd recommend a 13.5 tog duvet in the winter, a 9.0 tog in spring or autumn and a 4.5 tog duvet during the summer.

For more information, see our seasonal guides.