Sleep Better Isotonic Cool Slumber Mattress Topper, Full SleepBetter, Isotonic, and Active Air Technology are registered in the U.S. Patent and Trademark Office Isotonic is Registered in U.S. Patent and Trademark Office 2-inch, 2-1/2-pound density, visco-elastic foam with active air technoloy Hundreds of memory foam fingers help relieve pressure Cover is machine washable Hypoallergenic