What is Tog Rating (Duvets & Bedding)?

Tog rating measures the thermal insulation (warmth) of a duvet or bedding item — the higher the number, the warmer it is. UK duvets typically range from 4.5 tog (summer) to 13.5+ tog (winter), with 10.5 tog being a popular all-season choice. It is not a measure of quality or fabric type, only insulating warmth.