100% cotton shell, Breathable shell made of 250 thread count 100% cotton, Three inches of plush, hypoallergenic down alternative fill encased in pure cotton create a cozy, breathable mattress topper. Baffle-box construction prevents fill from shifting to ensure even loft. Thick elastic anchor bands secure the fiberbed to the mattress at the corners., Hypoallergenic down alternative fill, Baffle box stitching, 3 Inch Down Alternative Mattress Topper, 3" thick down alternative mattress topper adds a plush layer to any mattress, Hypoallergenic down alternative fill offers the feel of down without odors or allergens