THE WORLD&';S MOST TRUSTED KNEE BRACE HAS EVOLVED The K4 3.0 delivers a more natural fit, greater comfort and proven protection. Powered by Human MotionA(R) technology and refined through years of real-world testing. IMPACT MODIFIED FRAME Strong, lightweight and low profile, the Impact Modified Frame features Adaptive Cuffs that move naturally with your leg for all-day comfort. FULL COVERAGE IMPACT PROTECTION Maximum coverage with excellent ventilation. Removable impact guards make it easy to switch between motocross, MTB, snow and more. HUMAN MOTION A(R) HINGE Designed to work with your body, the Human MotionA(R) hinge helps redirect forces away from your ligaments while delivering smooth, natural movement. Reinforced ligaments, a stronger hinge housing and snap-in hinge pads improve durability and reduce maintenance. FLEX GRIP FRAME LINERS Bonded directly to the frame, FLEX Grip liners help keep the brace securely in place while reducing bulk. The nonabsorbent material stays fresh, comfortable and easy to maintain. DIAL IN YOUR FIT Adjustable Extension Control: Set extension from 10Adeg to 20Adeg with progressive control for smoother lockout. Custom Hinge Pads: Thin pads come installed, with thicker pads included for a personalised fit. Multi-Sport Ready: Removable impact guards let you quickly adapt the K4 3.0 for different sports.