High-density Memory Foam: 3 inch memory foam mattress topper is made of high-density memory foam and gel infused beads, which is more breathable and maintains a cooler temperature than ordinary memory foam, improving the sleep experience. High-density memory foam provides adaptive comfort and support to help relieve pressure points and increase softness Removable & Washable Cover: Our cover is made of viscose made from bamboo, which is skin-friendly, breathable. Zipper closure for easy disassembly and cleaning Upgraded Deep Pocket and Non-slip Design: The upgraded 360° fabric sides stretch easily to fit the mattress up to 21 "thick. It can easily be placed on most mattresses. And with a non-slip surface backing, it won't slide no matter how you twist on the bed Warm Tips: The product was delivered in vacuum packaging. Before the first use, please lay the memory foam in a well ventilated place for 24-48 hours until its smell dissipates and it fully expands Customer Satisfaction is Our Priority: We provide a 365 night satisfaction . If you are not satisfied with the product, please feel free to us to obtain a satisfactory solution