1Increase 40kg Strength: Add 40kg strength to the knee, reduce the pressure on the knee after squatting, specially made, the spring is strong. 2Universal Strap Style: Men, women and children can wear it to reduce the damage caused by weight to the knees. 3Mesh Breathable: Unsealed, Converted to Coolie Design, Non Slip Fabric. Exercise becomes easier, work becomes easier, squatting becomes easier, and life becomes easier. 4Features: After wearing a booster, it is recommended to use 3 springs when the knee is bent by about 45 to assist in climbing, carrying heavy objects, and those with serious knee damage. 5Spring Assist: It is recommended to adjust 12 spring assists for walking, climbing, running, and cycling to protect the knees strongly.