This Twin size 8-inch Pocketed Spring Comfort Foam Mattress features independent pocketed springs providing customized support while minimizing motion transfer for uninterrupted sleep. The Foam and Fiber Quilted Cover adds conforming comfort and the support for the mattress comes from the 7.5 inch pocketed springs. The Twin size 8-inch Pocketed Spring Comfort Foam 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. Twin size 8-inch Pocketed Spring Comfort Foam Mattress Firm, customized support from Pressure Relieving Comfort Foam and Pocketed Springs Support system is comprised of hundreds of independent pocketed springs to minimize motion transfer Only the Highest Quality of Foam-Foam is CertiPUR - US Certified for durability, performance, and content Dimensions - 39 x 75 x 8 inches