... structure, PATENT products; 2, apprepriate hardness, 20years warranty, 3, China Well-known Trademar Product feature1, Adoption of patent technology, unique balancing system ... ,good workmanship, good quilting. HOT SALE !!UNIQUE INNER STRUCTURE !!CHINA WELL-KNOWN BRAND !! About UsEstablished in 1990, Guangxi Hisleep Mattress Group Co., Ltd ...