Our 400 thread count sateen weave Silken Solid duvet cover is softer than silk, cooler than linen, more absorbent than cotton. A clean and modern aesthetic combined with dramatic performance, it is drapey, wrinkle free, crisp, cool, soft, affordable luxury. So what is TENCEL® exactly? It's a new age fiber made in harmony with nature whose unique structure creates an optimal skin climate for the soundest of sleep.