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Duvet Tog Explained The majority of duvets have a tog rating, which specifies the temperature of the duvet. Duvets with low tog ratings might not be enough to keep you warm and may feel heavy if used with a quilt that is weighted. Personal preferences are also a factor as each person has different methods of regulating heat while they sleep. Some people prefer a thicker duvet, whereas some find it too hot and bulky. Weight In the UK the term "duvet rating" is used to describe the ability of a duvet's fabric to retain heat. The more high the tog the