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Choosing a Duvet Insert That Fits Your Mattress and Preferences A good night's sleep starts with the best bedding. This includes a duvet made to fit your mattress and your preferences. When choosing a duvet's thickness, it is important to consider the filling material. Natural down (feathers of ducks or geese) is the best choice because it is breathable, warm, and soft. 1. Thread Count You'll probably see the term "thread count" used in bedding and, for a lot of, it is seen