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The Warmest Tog Duvet For a Comfortable Night's Sleep A duvet with the right temperature rating can make a huge difference to your night's sleep. Too high and you run the risk of overheating If you set it too low, you can struggle to stay cosy. Tog ratings can differ, and the type filling used can also influence the rating. Natural fillings such as feathers and down are better insulation than synthetic ones like hollowfibre. Top choice A more substantial duvet w