【Cool & Breathable Sleep】Open-coil design boosts airflow while gel-infused foam regulates temperature. The open structure allows air circulation to prevent heat buildup, and gel foam absorbs/dissipates body heat. Stay cool all night for a refreshing sleep, ideal for hot sleepers or warm climates. 【Exceptional Motion Isolation】900+ individually wrapped 2.1mm pocket springs absorb movements independently. Each spring reacts only to local pressure, minimizing motion transfer. Perfect for couples/light sleepers—no more disruptions from tossing/turning. 【Comfort & Medium-Firm Support】Multi-layered foam cushions shoulders/hips while reinforced springs align spine. Foam contours to relieve pressure points, and springs provide targeted support. Balanced feel suits side/back/stomach sleepers, reducing aches. 【Risk-Free Sleep Experience】365-night trial + 10-year warranty. Test at home for a full year to ensure comfort. Warranty guarantees durability and quality, offering peace of mind. 【Certified Safe for Sleep】CertiPUR-US/OEKO-TEX/CFR1633 certified. Free from fiberglass, heavy metals, and harmful chemicals. Safe for all sleepers, creating a healthy environment. Marine Moon Medium Firm Spring Mattress combines individually wrapped pocket coils with CertiPUR-US certified gel memory foam for optimal support, pressure relief, and cool sleep. Ideal for back pain sufferers, this hybrid design minimizes motion transfer while delivering a balanced blend of comfort and durability. Perfect for all sleeping positions.