a),UNIQUE balancing-net structure, patent products; b), HIGH-QUALITY,20 years ... balancing system;2, Special use of super-elastic balancing net and few springs;3, Effectively distributes body pressure, provide ... structureBalancing elastic netPP webbingPatent productAdded (inside)springs20~40 units Front side quilting materials1st layerFabric 2nd layersponge1.0cm3rd layersponge1.0cm4th layerNon- ...