Innovative Construction: The Suiforlun 15 inch king size mattress features a thoughtful 7-Layer hybrid construction with 50D gel memory foam, 40D charcoal memory foam, high-density foam and 8.5-inch individually wrapped coils, allowing your body to fully relax during sleep. Cool Clean Sleep: The hygroscopicity and breathability of charcoal and gel infusion keep the mattress odor free and fresh, promoting a cool and refreshing sleep environment for persons who sweat easily or have sensitive skin. Long-lasting Support For Heavy People: This king hybrid mattress boasts superior edge support by encasing 11 guage firmer pocket coils on preimeter and 13 gauge resilient support core for spinal alignment and motion isolation, ensuring a consistently comfortable and supportive sleep surface. Elegant Luxury High-profile: At 15 inch thick, this medium plush king mattress strikes the perfect balance between softness and support. The scientific combination of carefully selected materials materials deliver a one-of-a-kind sleep experience for all sleeping positions. Plus, you can use it without box spring while retaining the bouncy supportive feel. Exceptional Performance: The foam meet CertiPPUR US standard and does not contain harmful substances. This fiberglassfree mattress king is rigorously tested to ensure that it will not deform during long-term use. Along with 10-year support and 120-night-sleep trial, you can set your body and mind at ease.