The Zinus Support Plus Mattress collection is made with an additional 10% more individually wrapped iCoils in the core of the mattress to provide extra support and motion separation for a comforting night’s sleep. The foam layers above the Support Plus iCoil Springs adjust to your body to give you a customized, comforting, sleep surface. This unique combination of Support Plus iCoil Springs along with comforting foam layers will help you sleep well and wake up refreshed. Please open your mattress package within 72 hours of receipt and allow 48 hours for your new mattress to return to its original, plush shape. Another comfort innovation from Zinus. Pioneering comfort.