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The Warmest Tog Duvet For a Comfortable Night's Sleep The best duvet can make a a big difference to the quality of your sleep. If you set it too high, you risk overheating or too low and you can struggle to stay cosy. Tog ratings can vary and the type of filling used can also influence the rating. For example, natural fillings like feather and down are more thermally insulating than synthetic ones like hollowfibre. Top pick If you're looking to remain warm throughout the winter then a heavier duvet is the best choice. These quilts have a high tog rating that will