The Feel This 12" mattress has a medium feel that combines a thicker soft comfort layer and all the support of memory foam. Dual Memory Foam Layers Let"s break down how this mattress is engineered for sleep. First is the plush memory foam comfort layer which is softer and lighter than other memory foams. Lucid"s foam will adjust to your individual pressure points to relieve shoulder, neck, and back pains. Memory foam also helps to isolate motion transfer between sleeping partners. Next is a 2" memory foam support layer. This second layer is designed for deep down support, which balances out the softness of the top layer. Safe for You and the Environment Our foam is CertiPUR-US® certified which means it has been independently tested for safety of materials used, physical performance, and environmental stewardship. Careful construction guarantees no prohibited phthalates, no ozone depleters, no CFCs, no mercury, no formaldehyde, no PBDEs, and low emission (VOCs) for indoor air quality. Lucid"s memory foam is naturally resistant to allergens and dust mites. This mattress does not contain synthetic or natural latex of any kind. Conveniently Shipped for Easy Set Up All of our products are shipped vacuum packed, so your mattress is easy to transport and set up. After your mattress arrives, simply take the package into the right room, remove it from the box and protective wrap, and then watch as it expands. Includes one Twin XL mattress (38" x 79") and cover. Mattress cover may vary from picture in pattern and color. Need a Frame? For warranty purposes Lucid recommends this frame and box spring in one: http://www.amazon.com/gp/product/B00ENQQTY8