The world’s most highly regarded knee brace has evolved.

The K4 3.0 is designed to follow your movements, offering a natural fit and a high level of protection when you need it most.
Equipped with Human Motion® technology, it has been refined through years of testing and real-world use.
Impact-Modified Frame
The impact-modified frame combines strength, lightweight construction, and a low-profile design, while the adaptive cuffs follow the movement of your leg, ensuring all-day comfort—no matter the terrain.

Comprehensive Impact Protection
Engineered to provide full impact protection while ensuring excellent ventilation for maximum comfort. The protective guards can be quickly removed, making the K4 3.0 suitable for a wide range of sports.
Human Motion® Hinge: Designed to work in harmony with the body’s natural movement, the Human Motion® hinge helps deflect forces away from the ligaments, ensuring smooth, natural motion throughout the entire range of joint articulation.
Featuring reinforced ligaments, a strengthened hinge housing, an integrated knee-containment system, and quick-insert hinge components, the K4 3.0 is built for reliable performance and minimal maintenance.
FLEX Grip Frame Liners: Attached directly to the frame, the FLEX Grip liners help keep the brace securely in place, reducing unwanted movement and bulk while requiring very little maintenance.
The non-absorbent material resists sweat and moisture, keeping the brace fresh, comfortable, and odor-free, ride after ride.
Customize your fit. Extension Adjustment
Set your desired extension limit—between 10° and 20°—to suit your riding style. The progressive extension control system helps cushion the end of the range of motion, slowing the joint’s movement before it reaches full extension and thereby reducing harsh impacts on the knee.
2. Hinge Pads
The brace comes with thin hinge pads pre-installed, and a set of thicker pads is included in the owner’s kit, allowing you to customize the fit to your specific needs.
3. Ready for Multi-Sport
From the track to the trails, and from the water to the snow, the K4 3.0 adapts to you. Removable impact guards make it easy to switch between different sports in just a few minutes.