Features: Makes you feel light, allowing you to lift each knee easily as you go along with your activities. Powerful Rebound Spring Force-It works to support your thighs and calves, effectively reducing the pressure on your knees. Breathable Mesh, Non-slip Fabric- It’s comfortable… whether worn directly wrapped around your bare knees or over your pants. Each pad can withstand a weight of up to 20 kilograms. Can be attached to concave fabric, easy to use. Carbon steel spring, the diameter is 15mm. Manually rotate the screw, convenient. Suitable for mountain climbing, climbing stairs, helping you climb more easily.