Flexapedic 4'' Memory Foam topper features 2'' 40D memory foam + 2'' 25D regular foam, 250gsm knit face with 3M moisture management treatment, 100gsm anti-slip reverse, knife edge, and 4'' self-gusset. Topper provides end to end coverage on your bed, adjusts to body temperature, is resistant to dust mites, and is antimicrobial. Zippered cover is removable and washable.