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What To Look For In A Duvet Finding the right duvet is among the most important purchases you make for your bed. It can be difficult to pick the best duvet when you must consider tog ratings, fillings and sizes. The tog rating is a measure that measures the warmth of a doona or sleeping bag. It is a requirement of British Standard BS4745:1990. 1 tog Duvets are rated according to a tog and that those with higher ratings tend to be more thicker. Tog ratings are used to explain the temperature