This luxury natural feather duvet has a 90% Hungarian white goose feather and 10% down filling and a 233 thread cambric cotton feather proof casing cassette stitching to give an even and natural drape Natural Filling Conforms to BS 5335 Fully Washable Available in 4.5, 10.5, and 13.5 touches of warmth. Single, Double, Kingsize, and Superking Sizes. 90% Feather 10% Down. Casing: 233 TC 100% Cotton