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What To Look For In A Duvet The right duvet is one of the most important purchases you'll make for your bed. It can be challenging to choose the right duvet when you must take into consideration tog ratings, fillings, and size. The tog rating is a scale that measures the warmth of a doona or sleeping bag. The British Standard BS4745-1990 defines it. 1 tog You might have noticed that duvets have an tog rating, and that duvets with a higher tog rating are more dense. Tog rat