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What Does Tog Mean on Duvets? When selecting the ideal duvet, there are many factors to be aware of, including its rating and material. Duvets are different from quilts with batting, a top layer and a bottom layer. They are made from feathers, synthetic fibres or wool. Tog ratings can have a huge influence on how warm you will feel at night. Choosing the right tog will depend on your bedroom temperature and season, as well as whether you're a cold or warm sleeper. The tog rating is used to determine the thermal insulation properties of duvets. Tog r