Donjoy 4Titude CI Std Ligament Knee Brace For Right & Left Leg is lightweight brace that provides durable support for mild to severe ligament instability. It is a low profile prefabricated ligament brace. It is an off-the-shelf functional brace with standard length of 16 inches. It is ideal for moderate to severe ACL and/or PCL, ACL/ PCL combined instabilities (CI), MCL and LCL instabilities for active, sedentary and adolescent patients.