NWT Pottery Barn elegant King/Cal. King Duvet cover. The soothing blue and green colors create a beautiful calming atmosphere for your bedroom and a touch of nature with this botanical like pattern. 108” x 92” Details: The front of the duvet is woven from 85% cotton and 15% linen. The back is 100% cotton. Features a hidden button closure with inner ties that keep the insert in place. Sold out at Pottery Barn.