Shop custom knee braces by DonJoy. Custom knee braces are custom-fitted to your knee to help provide the right fit and protection for your knee. Our custom knee braces are low-profile and light allowing you to stay active without the bulk. Should you wear a custom knee brace? Athletes looking for support and protection for moderate to severe ligament instabilities such as the ACL / PCL, MCL / LCL, and CI (combined instabilities) may benefit from a custom brace. Our Fourcepoint Hinge Technology helps reduce the amount of the time your knee is at an “at-risk” position. Our two custom braces include the DonJoy Defiance III and the DonJoy A22. These knee braces are ideal for many sports like football, basketball, football, volleyball, and water sports. Note: Due to the customization of the Defiance III and A22, these custom braces are not eligible for general returns or the 30-day moneyback guarantee.