Two Types: Choose adult models for heights above 1.5m and children models for heights below 1.5m; comfortable and breathable, with enhanced auxiliary belts, and scientific correction. Using Time: The nylon braid is designed and made, about 1.5 hours a day for the first two weeks, mainly to adapt to the legs, learning habits, and gradually tighten the strength. After adaptation, it is not less than 30 minutes each time about 2 hours a day. the effect will gradually show, the treatmen-t cycle is 2-3 months. Principle: Air sac acceleration, physical traction, two-way air sac compression, physical traction on both ends of the leg, moderate force. Detachable: Built-in long aluminum strips on both sides fit the contours of the legs, and the power is concentrated on both sides of the legs; aluminum plate support, detachable. 3 in 1: Full coverage-thigh belt, knee belt, calf belt, widened and thickened, avoid replacement, large contac t area, comprehensive coverage.