1Main and auxiliary pull straps are strongly fixed, not easy to loose, and easy to adjust the tightness. 2Three belts in one, specially designed for knee shaping with depthadjustable double knee bone structure. 3Two splints are fixed on both sides to effectively support the fixed leg type. 4Threedimensional pressure, balanced force, balanced traction, no displacement or fall off. 5Help you correct unsightly leg curves caused by bad walking habits.