Neoprene sleeve provides compression and warmth to increase circulation. Durable, composite hinges prevent hyperextension and have a dual-axis to glide smoothly with knee movement. Sides of the knee are padded and protected against impact during activity. Stabilizes the patella. Open patella design. Four adjustable support straps for additional compression. Low-profile, slip-on style for easy application. Color: Black. Fits Right or Left Knee. For proper sizing, measure around thigh 4" above the center of kneecap and around calf 4" below center of kneecap. Small fits thighs 15 - 18" and calves 11 - 13". Medium fits thighs 18 - 21" and calves 13 - 16". Large fits thighs 21 - 25" and calves 16 - 19". X-Large fits thighs 25 - 29" and calves 19 - 22". For health and hygenic reasons, except for initial try-on, brace is non-returnable once worn. Indicated for mild to moderate ligament strains, sprains, hyperextension, and chronic knee instability problems.