Asterisk Ultra Cell Knee Brace - Black Also available in White The UltraCell is built on 10+ years of time-tested and proven designs of the original Cell Knee Protection System. Those original concepts have been refined, improved, and entirely re-engineered to create the UltraCell. The UltraCell is, as its predecessor, completely customizable to the leg while remaining extremely rigid. A.C.M. Frame Anatomically correct design Carbon fiber epoxy matrix Rigid Lightweight, impact distributing structure Asymmetry Glide Hinge Tracks the natural rolling-gliding motion of the knee joint Asymmetrical design allows each hinge to set properly Allows for automatic tibia alignment of lower frame Condyle shims for fine tuning fit A.R.C. Cuff Adjustable retention control Multiform rigid lateral support Built in anti rotation connection Stainless steel retention strips Inverted adjustment increases lateral rigidity Anti-Rotation Tether Links the brace to the boot making them as one Transfers forces of a lower leg rotation Adjustable to suit each individual Dual Independent Securement system Medial macro-adjustment Superior security to strapping Boa closure system provides smooth even closure and no pressure points Quick Release tabs Tele-tri Patella cup Telescoping three piece design High impact nylon 6 material Full range of motion coverage of the knee cap Thermo-formed EV50 Shock absorbent foam padding Thermo-formed padding Thermo-formed for precise fit Forms to leg shape using your body heat Water Resistant Sizing To ensure proper fit, circumference measurements should be taken directly on the skin with the leg straightened, using a soft tape measure. (If soft tape measure is not available, a piece of string or yarn may be used to calibrate the leg's diameter.) Locate the middle of the kneecap and measure around the leg. Measurements should be taken directly on the skin with a straight leg. Size (in) (cm) Small 13 - 13 7/8 33.02 - 35.24 Medium 14 - 14 7/8 35.56 - 37.78 Large 15 - 15 7/8 38.10 - 40.32 X-Large 16 - 16 7/8 40.64 - 42.86 XX-Large 17 - 18 1/4 43.18 - 46.36