High Quality Knee Brace Patella Booster Spring Knee Brace Support For Mountaineering Squat Sports Knee BoosterOverview: Adjustable length, easy to disassemble stickers. Special manufacturing spring, strong rebound force. When you pick up, your knee strength can be increased by 40KG. It can be worn inside and outside, and the length can be adjusted. Breathable non slip fabric with venting holes; suitable for climbing stairs, climbing, sports, etc. With the booster, when the knee is folded, there will be a certain angle to start the elastic force. Specification