The Triaxial Hinge helps give you maximum medial-lateral support without restricting mobility. The ultimate brace for week or injured knees. The Triaxial Hinge closely simulates the natural tracking of the knee joint, while the fitted slip-on sleeve with adjsutable straps provides a custom fit. Recommended to help provide support to weak, injured or arthritic joints; helps prevent medial-lateral movement and hyperextension of the knee. Instructions: Loosen all straps Pull brace on and over your knee Align kneecap just above the butress Tighten top and bottom straps Adjust as needed to obtain optimal comfort and fit Sizing: Measure around the center of the knee.