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What is the Average Tog For a Duvet? Traditionally, you'd select duvets based on the time of year: 4.5 tog duvets are ideal for long summer nights and 10.5 tog is great for winter. With a variety of sizes and fillings it's now possible to get a duvet that can be used all year round. Tog is the thermal overall quality of a duvet. It indicates how warm it will feel. It does not refer to weight since that is dependent on the filling type. 1 tog Historically, you would select your duvet based on the season, with lighter summer weight duvets (4.5 u