1,balancing elastic net structure, PATENT products; 2, apprepriate hardness, 20years warranty, 3, China Well-known Trademar Product feature1, Adoption of patent technology, unique balancing system;2, Special use of super-elastic balancing net and few springs;3, Effectively distributes body pressure, provide you a healthy and comfortable sleep;4,high-quality, 20years warranty;5,high-density foam, ...