Designed to offer a 3 in 1 solution for all seasons. The 4.5 Tog keeps you cool over the summer months while the 9 Tog is perfect for keeping you warmer on cooler nights. Both duvets can be fastened together to give extra warmth on the chilliest of winter nights, keeping you extra toasty. Cover: 100% Cotton Filling: 80% Hungarian goose down, 20% Hungarian goose feather