Features1POWERFUL SPRING FORCE: Power lift knee brace adds 40kg / 88.2lb of strength to your knees and reduces the pressure on your knees when you squat, with a special spring for extra strength. 2UNIVERSAL STRAP STYLE: Knee stabilizer pad is a universal strap that can be worn by men, women and children to reduce weight damage to the knees. 3MESH VENTILATION: Mesh breathable, non sealing, non slip fabric. Exercise becomes easy, work becomes easy, squat becomes easy, life becomes easy. 4ASSISTED KNEE FLEXION: With the knee protection booster, the rebound booster starts to help hiking and heavy lifting when the knee is bent at about 45 degrees. 5NOTE: 3 springs are recommended for those with serious old knee damage. The use of walking, climbing, running, cycling is recommended to adjust the 1?2 spring booster.SpecificationItem Type: Knee Protection BoosterMaterial: Polyester FiberProduct Function: Protect the Knee from Gravity, Suitable for Climbing, Mountaineering, Sports and Fitness Etc.Color: GrayPackage List1 xKnee Protection Booster