Super stiff mono-hinge frame with three-point force dissipation. Hybrid AirFlex knee shell with impact gel and hard shell regulator for the ultimate in knee pad comfort. Force reduction to limit knee injuries: anterior cruciate ligament, meniscus, and medial collateral ligament. Very flat profile on the inside of the knee for an excellent riding experience. Certified as a medical device: EU CA014741, USA FDA 10048761. Impact protection, CE approved and certified: Knee EN1621-1. Over-extension limitation of 10°, 15°, 20°, and 25° to reduce cruciate ligament injuries. Integrated predetermined breaking points tested in the laboratory. The C-frame is designed to break before injury occurs on the shin bone or on the thigh bone. Comfortable, flat shin plate with pressure distribution pad that fits all boots. Size: S/M, L/XL, XXL. Plastic-free recyclable packaging.