The Back on Track® Mattress Overlay not only has the properties of our exclusive Welltex® fabric, but is designed to assist the body’s circulation while adhering to an element of comfort and durability. Many feel it helps them sleep better and longer so that they wake up refreshed and more limber. The Mattress Overlay is a fantastic addition to a good night’s sleep in any household, hotel, or home-away-from-home. How to get the Best Performance from your Overlay: -Place your mattress overlay on top of your mattress and cover it with a thin sheet. -Wear light weight pj's so the FIR benefits are best achieved -1 inch Thickness - Sizing: 160cm x 200cm (63" x 79")