Donjoy Armor FourcePoint Left Knee Brace XXL with Suspension sleeve and Strap Convers Donjoy's Armor Fourcepoint is a protective knee brace that helps keep athletes and patients out of the at-risk position for suffering ACL injuries; Four-Points of Leverage design. Features: This brace features the Donjoy FourcePoint Hinge Technology, which provides excellent stability and control over knee flexion and extension. Purpose: The Armor FourcePoint is particularly suitable for individuals with ACL or MCL instability or injury