Inner memory foam: Subrtex 3" gel-infused memory foam mattress topper uses 3.5 pound density memory foam, mattress topper with ventilated design optimizes air flow and reduce trapped body heat, creating a cooler and more comfortable sleeping environment Removable & washable cover: The rayon made from bamboo cover adopts skin-friendly knitted fabric, comes with adjustable elastic straps which fit mattress depth up to 12", equips with mesh fabric backing to prevent sliding and premium metal zipper for easy removal and washing