Take your bed to the next level of comfort and support. This 4-inch Loftworks Supreme mattress topper turns nighttime into a restful haven. The superb pressure-relieving comfort is achieved with a combination of 2-in Jelly-soft memory foam and 2-in high resistance foam to provide the support for healthy sleep posture as well as relief of pressure points. -5 zone design reduces pressure at different points of body contact to help reduce tossing and turning -Viscose bamboo rayon blend zipper cover that is breathable, hypoallergenic and machine washable -L shape zipper for easy removal and anchor bands to secure the topper on your mattress -CertiPUR-US certified memory foam with 3-year limited warranty -Ships compressed in an unmarked box. Remove from packaging within 72 hours. Allow 48 hours for this product to return to its original shape. -Top: 240gsm circular knit cover, 40% rayon, 60% polyester; bottom：80% polyester, 20% cotton non-slip fabric Full: 53 in x 74 in Queen: 58 in x 78 in King: 76 in x 78 in California King: 70 in x 82 in Imported Material & Care Polyester Spot clean only