Our mattress is our best overall pick, offering an excellent balance of comfort, support, and motion isolation. The “just-right” medium feel is ideally suited for side, stomach, and back sleepers, and for couples with differing sleep preferences. Features: Martisiluna 12 inch mattress knitted fabric is made of 100% cotton, which has passed CertiPUR-US certification to provide you with a soft and skin-friendly experience. The unique pocket spring system can respond promptly according to the sleeper's weight and fit the body's spine, which provides excellent support and stability. The independently encased coils design keeps you from being disturbed by your partner. The high-bounced pocket springs of the 12 inch mattress provide a medium firm sleeping feeling, whether you are a back, stomach or side sleeper, it can help you quickly enter deep sleep and wake up refreshed. Cooling-infused gel memory foam and support foam can increase the air circulation inside the mattress, which could decrease your body's overheating temperature quickly and release the sleep signal, giving you cool sleep all night. Martisiluna has a professional customer service team to solve any pre-sales and after-sales issues for you. Kind Remind: Since our mattress is rolled in a box, please give it 72 hours to fully expand. It will be softer for sleepers over 200 pounds, but medium firm for sleepers under 200 pounds. Since the heavier the weight is, the softer it feels. Dimensions: Twin: 39 inches wide x 75 inches long x 12 inches thick Full: 54 inches wide x 75 inches long x 12 inches thick Queen: 60 inches wide x 80 inches long x 12 inches thick King: 76 inches wide x 80 inches long x 12 inches thick