This luxurious, four-inch mattress topper provides incredible comfort & pressure relief. Copper-infused foam is paired with structural foam to deliver the stability that promotes spinal alignment and reduces discomfort in bed. The foam layers are wrapped in an innovative, cooling cover to reduce heat & keep you dry. 4" of American-made, durable foam promotes circulation Phase-changing yarns cool the cover to a room's ambient temperature Thermal Deflection Technology in the cover actively deflects body heat Copper-infusion & washable cover establish a hygienic sleep surface Adjustable straps & anti-slip mesh for a secure fit & uninterrupted sleep