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What To Look For In A Duvet The duvet you choose for your bed is among the most significant purchases you'll make. But with tog ratings, fillings, and dimensions to consider, it can be tricky to determine what you want. The tog rating is a measurement that measures the warmth of a doona or sleeping bag. The British Standard BS4745-1990 specifies it. 1 tog You may have noticed duvets are rated according to a tog and those with a higher rating tend to be heavier. Tog ratings are used as an