From Peacock Alley,  this duvet cover insert features: If down is not for you, consider our Dacron® down alternative duvet. To ensure that it is just as cozy as down, we developed a special blend that clusters, lofts, and compresses like the real thing. Plus, the alternative fiber echoes downs softness and adjustable insulation.  100% Cotton outer shell 400 thread count sateen shell Hypoallergenic Filled with Dacron® Down Alternative Twin/Twin Extra-Long Down Alternative Duvet approx. 68" x 90" / Year Round Weight - 24 oz. Full/Queen Down Alternative Duvet approx. 90" x 90" / Year Round Weight - 33 oz. King/California King Down Alternative Duvet approx. 105 x 90 / Year Round Weight - 40 oz. Dacron® is a brand of polyester used as down alternative fiberfill; fibers can be luxuriously fine and lofty like down itself, or firm and supportive for use in mattresses and mattress pads. Professionally launder or machine wash cold in a large capacity or commercial washer. Dry on low heat. Imported.