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Highest Tog Rating Duvets and Baby Sleeping Bags The highest rating for tog was developed for winter use when you need a duvet that will keep you warm. The term"tog" is short for Thermal Overall Grading. It's used to describe the warmth of duvets, baby sleeping bags, and other bedding items. However, thicker fabrics do not always mean more warmth - it depends on the filling type and how well it insulates. Extra Warm When choosing a duvet there are many factors that can be consi