The DonJoy Armor knee brace with FourcePoint hinge technology also combines DonJoy's proven 4-Points-of-Leverage System. This allows knee hyperextension and moderate to severe ACL instabilities to be continually corrected. The FourcePoint hinge technology makes you less likely to suffer from an ACL injury because it reduces the amount of time your knee is in an "at risk position" and enhances the 4-Points-of-Leverage by increasing the posterior load applied by the brace on the tibia. It improves your natural gait by applying progressive resistance before reaching a firm end point during movement. The DonJoy Armor knee brace is used to treat or prevent the following injuries: moderate to severe ACL, MCL, and LCL instabilities, recovery from ACL reconstructions, and hyperextension prevention. This knee brace is not recommended for PCL injuries or instabilities. This brace is best suited for active individuals with ligament instabilities and athletes involved in extreme or contact sports brace like football, skiing, snowboarding, motocross, surfing, wakeboarding, and more. Get a perfect fit by molding the brace to your knee, as well as enhance the fit and suspension of the brace with the swiveling strap tabs. The DonJoy Armor knee brace with FourcePoint hinge technology helps athletes that can't afford to be weighed down by a heavy brace, and are not trying to prevent contact. Made from a strong aircraft-grade aluminum frame, you get the benefits of a lightweight, sleek low-profile knee brace that is also stronger, thicker, and more stable than the other lightweight knee braces on the market.