a),UNIQUE balancing-net structure, patent products; b), HIGH-QUALITY,20 years warranty, c), China WELL-KNOWN Trademark 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, 10years warranty. UNIQUE INNER STRUCTURE !! ...