* Indicated for arthritis, post-operative management, medial and lateral instability * Upper and lower circumferential straps * Covered aluminum hyper-extension hinges * Opens fully flat for simple application * Fits left or right * Latex free SIZE CALF CIRCUMFERENCE X-SMALL 12" - 13" SMALL 13" - 14" MEDIUM 14" - 15" LARGE 15" - 16" X-LARGE 16" - 18" XX-LARGE 18" - 20" XXX-LARGE 20" - 22"