The Hg80® Hinged Knee Orthosis is simply the most convenient support. Mueller-exclusive HydraCinn® fabric is an anti-microbial barrier, high-strength, moisture-repellent material. * Mueller® hinged knee orthosis provides maximum medial lateral support without restricting your mobility. The triple joint ensures mobility according to the knee joint, while the cushion that moves the opening helps to stabilize and protect your patella (kneecap). Fits both knees.