Downia - Two 50/50 White Duck Down duvets for year round comfort - Features:280 thread count downproof cotton casing for luxury feel - White sateen piping - Sewn through cassette for even fill to prevent cold spots - The Downia Four Seasons White Duck 50/50 Feather & Down duvet is designed for year-round use with its two 50% white duck down and feather duvets. Although both duvets have the same composition of 50% duck down clusters and 50% duck feathers, they actually provide varying warmth for use in any season with a lighter and heavier duvet. Come winter, the two duvets can be clip together to create extra warmth.