Mueller Hg80 Premium Hinged Knee Brace Made with HydraCinn fabric, a non-neoprene, lightweight, moisture-wicking material with antimicrobial barrier and redesigned, bilateral steel springs to support both sides of the knee while also providing increased performance. High-strength stitching ensures a comfortable, long-lasting fit. Improved hourglass shape hugs natural curves of knee while new comfort zone reduces bunching in back of knee during active motion. Upper and lower strapping locks brace in position. Upper bidirectional stretch material is formfitting and fully adjustable with anti-slip inner grip strips that prevent brace migration. Tibial containment system with stabilizing patellar buttress and rear support strap. Open knee with gel supports for stability. Fits left or right.