Slumberdown Truly Washable duvets however have been tried & tested to 5 washes and they look & feel as good after the 5th wash as they do before the 1st. Our lovely and snuggly hollowfibre filling is soft and comfortable. It gently wraps around your contours so it stays with you as you move in the night. It's also lightweight even at high tog counts. The luxury microfibre cover is wonderfully soft and cool to touch. This cosy 10.5 tog duvet is perfect for use all year round. Kingsize duvet. 10.5 tog duvet. 100% polyester hollowfibre filling. 100% soft touch polyester microfibre cover. Machine washable at 40C. Suitable for tumble drying. Non-allergenic.