The Sleep Master Ultima® Comfort 10 Inch Pillow Top Spring Mattress by Zinus features hundreds of independent I Coils providing customized support while minimizing motion transfer for uninterrupted sleep. The pillow top is formed with a 1 inch layer of Pressure Relieving Comfort Foam, on top of another 1.5 inches of Comfort Foam and a layer of High-density Foam. The support for the mattress comes from the 7.5 Inch coil Pocketed Springs. The Sleep Master Ultima® Comfort 10 Inch Pillow Top Spring mattress offers exceptional support, keeping you aligned and pressure free for a great night's sleep. 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.