The Astoria Visco Memory Foam mattress is designed to be supportive with a soft sleeping surface. This mattress layers two different densities of visco memory foam to create a mattress that contours to the body while the air channel base provides the perfect level of support and air flow. The top 2 layers consist of 4 inches of 100% pure visco memory foam. These two layers are supported by the Sleep Science Air Channel base. The sitting edges of the mattress features the Sleep Science patented Wedge support system to create a stable sitting edge and maximizes the sleeping surface. The cover is removable and washable.