Check the listing for details. Mueller Hg80 Premium Knee Brace. Color: Black, Condition: New. Listed at 64.99 USD. Mueller Hg80 Premium Knee Brace The Hg80® Premium Knee Brace is incredibly comfortable. Supportive steel springs support both sides of the knee, yet still allows leg flexion and extension. So you get the support you need without hampering your flexibility. Recommended to help control sublaxating patellas and to help support your stiff, sore, or unstable knees. The upper features bidirectional stretch material for a comfortable fit and fully adjustable for superior support with no slip. Mueller-exclusive HydraCinn® fabric is a high-performance, moisture-wicking material with an anti-microbial barrier.* Sizing Chart: Determine the correct size by measuring the circumference around the center of the knee: Product# Size Knee Circumference 59111 SM 12in - 14in 59112 MD 14in - 16in 59113 LG 16in - 18in 59114 XL 18in - 20in 59115 2XL 20in - 22in