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The Warmest Tog Duvet For a Comfortable Night's Sleep A duvet that has the right temperature rating can make all the difference to your sleep. You can overheat if you set the temperature too high, however if you set it too low, you might struggle to stay warm. Tog ratings can vary, and the type filling used can influence the rating. Natural fillings, such as feathers and down are more effective thermal insulators than synthetic alternatives like hollowfibre. Top pick If you're looking to remain warm during winter, a heavier duvet is the best choice.