Transform your mattress from ordinary to extraordinary with the European white down mattress topper by royal velvet. The 233 thread count cotton cover offers a breathable, cozy fabric that will last for seasons to come. Top layer is filled with a luxurious layer of European white down for comfort and hotel-like feeling while the feather base layer adds loft and support. Our natural fill is washed with Oxipower technology that exceeds the industry standard for cleaning natural fill contents. We wash our material 18 separate times to ensure a complete disinfected and hypoallergenic fill which is responsible down standard certified. A 15-inch stretch skirt to secure the topper to a mattress up to 18 inches thick. Topper is machine washable for easy care. Contains RDS Certified Down: The goal of the Responsible Down Standard is to ensure the waterfowl in the down supply chain are treated humanely.