This duvet is filled with a high quality blend of 80% white down and 20% small waterfowl feather that provides the perfect amount of warmth and comfort all year long. The breathable specialty woven 240 thread count down proof 100% cotton shell is finished with reinforced double stitching, piped edging, and features a baffle box design with Duvetlock® to ensure warmth is maintained evenly and cold spots eliminated.