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Duvet Tog Explained The majority of duvets have a tog rating that identifies the warmth 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 preference is also crucial because everyone is different in how they regulate heat when sleeping. For instance, some prefer the cosy feeling of a duvet that is thicker, whereas others find them too heavy and hot. Weight In the UK, a duvet rat