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Duvet Tog Explained The majority of duvets have a tog rating, which indicates the warmth of the duvet. Duvets that are cheap and have low ratings may not be capable of keeping you warm and could be heavy when used with a weighted quilt. Personal preferences are also a factor, as everyone has different ways of regulating heat when they sleep. For example, some prefer the cozy feel of a duvet that is thicker, whereas others find them to be too bulky and hot. Weight In