DOUBLE-LAYER DESIGN: The top foam layer is firm gel memory foam, and the bottom layer is a extra firm support foam. The mattress topper combines these two kinds of foam, which provides the perfect balance of firm and better support during sleep. REMOVABLE AND EASY TO CLEAN: The memory foam mattress cover is made of high quality knitted zipper cover and soft next-to-skin material. This mattress topper cover has a zipper design and is washable, so you can easily put the cover in the washing machine to keep it neat and tidy. GEL INFUSED: The memory foam mattress topper is infused with gel particles, which can effectively regulate body temperature. The top layer of gel memory foam has a ventilated perforated design, which is very effective in maintaining a clean and fresh sleep environment.