LUCID Plush Down Alternative Fiber Bed Topper-Allergen Free, Full XL Ultra-soft hypoallergenic down alternative fill offers the comfort of traditional down without odors, allergens or sharp quills 250 thread count, 100% cotton percale cover on both sides of the topper is soft and breathable Baffle box stitching helps maintain loft, improve breathability, and keep fill from shifting or clumping A thick elastic strap is positioned on each corner to securely attach the topper to the mattress Full XL size topper measurements are 53" x 80"; 3-year U.S. warranty