For the ultimate sleep experience, try our mattress topper on top of your current mattress. Filled with the renewable, hypoallergenic down alternative Sorona® This topper actually becomes loftier with each washing Finished with an added moisture-proof barrier for further protection. Luxurious 2-3˝ high box quilt design has a cotton sateen cover with a full elastic skirt of polyester that securely fits mattresses 14-18˝ deep.