The Slumberdown Cool Summer Nights Duvet is lightweight for cool comfort during warmer summer months. The soft touch cover and light and cosy hollowfibre filling make this duvet ideal to gently nestle around your body whilst keeping you feeling cool so you can enjoy a comfortable night’s sleep. Machine Washable. Cover Material: 100% Polyester Filling Material: 100% Hollowfibre. Ideal for the Summer Season and Warm Nights. Designed and Made in the United Kingdom.