SleepBetter Isotonic Iso-Cool Avela Mattress Topper with Oulast Cover, Queen Iso-Cool is Registered in U.S. Patent and Trademark Office 2-inch, 3-pound density, iso-cool avela memory foam with active air technology 300 thread count, 100-percent cotton cover with outlast adaptive comfort material 15-inch tightgrip skirt fits up to 20-inch Hypoallergenic and cover is machine washable