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What To Look For In A Duvet The duvet you choose for your bed is one of the most significant purchases you'll make. It can be challenging to pick the best duvet when you must consider tog ratings, fillings and sizes. The tog rating is a random scale that indicates how warm a doona or sleeping bag is. The British Standard BS4745-1990 specifies it. 1 tog You may have noticed that duvets have an os rating and duvets with a higher tog rating tend to b