QD bilateral protection belt stretching quickly relieve pain mechanical efficiency 4; a mechanism to tighten up and down independent waist size: 26-60 inch indications: degenerative disc sprain or strain facet joint arthropathy comprehensive disease syndrome unique driving loss of muscle function Design: with a 4: 1 mechanical and resistance, individually adjustable upper and lower part of the degree of tightening the belt, in order to alleviate back pain to provide direct pressure; Materials Innovation: Lightweight, breathable mesh skin-friendly material with unparalleled comfort and durability over resistance, it can be worn next to the skin or clothing compartment.