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Duvet Tog Explained Most duvets come with an tog rating that identifies the warmth of the duvet. Duvets that are cheap and have low ratings may not be enough to keep you warm and could be heavy when used with a weighted quilt. Personal preference is also important, as every person regulates heat differently when sleeping. For example, some prefer the comfort of a duvet that is thicker, whereas others find them to be too bulky and hot. Weight In the UK, a duvet rating is used to describe the