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What is For All Year Round? A duvet's rating for tog can mean the difference between a shivering or sweaty sleep, and a serene one. Knowing the tog of your duvet is important for a peaceful night's sleep all year long. In summer, opt for a lighter duvet. The ideal is 7.5 tog. This will allow you to stay cool and comfortable throughout the warmer nights. Winter Once autumn is in full swing, it's the perfect time to change your summer duvet in favour of an alternative that is more winter-friendly. You might be tempted by the warmest duvets particularl