Layer 1: The Tanzanite Mattress features a washable cover made from Tencel fabric, making the mattress extremely soft to the touch, durable, and easy to clean. The breathable and moisture-resistant Tencel fabric aids temperature regulation, keeping you comfortably cool while you sleep and guaranteeing you will never wake up in a sweat. Layer 2: Some may argue that a good night’s sleep isn’t exactly rocket science, but in this case, it is! The thick layer of memory foam is engineered to compress and expand around your body for optimum comfort. Layer 3: The thick layer of support foam utilizes advanced zoning technology in order to gently cradle your body while you sleep, supporting your shoulders and hips and ensuring spinal alignment. The thick layer of support foam greatly reduces motion transfer, ensuring that you can move, leave, and return without interrupting your sleeping partner. Layer 4: A layer of 1200 pocket springs adds bounce to the mattress.