Snuggledown Goose Feather & Down duvet is filled with a blend of 85 percent small goose feathers and 15 percent goose down surrounded by a 230 thread count cotton cover to create a warm and cosy duvet. It balances warmth, weight and loft to provide that lovely ‘tucked in’ feeling for a great night’s sleep. Our combination duvets are perfect all year round, made up of a 9 tog duvet and a 4.5 tog that can be clipped together to make an extra warm 13.5 tog duvet, so really you get 3 duvets all rolled into one. The idea is that you use the 9 tog for spring and autumn, the 4.5 tog in summer and both duvets clipped together in winter, but we'd say just play around with it until you find a right combination that suits you.