The Hg80 Knee Brace is an incredibly comfortable brace, featuring supportive steel springs that support both sides of the knee, yet still allow leg flexion and extension. This then provides the support you need without hampering your flexibility, recommended to help control sublaxating patellas and to help support stiff, sore, or unstable knees.There is upper and lower strapping locks that brace in position and upper bidirectional stretch material that is form fitting and fully adjustable for superior support that wont slip. The tibial containment system features a custom secondary shell with stabilizing patella buttress and rear support strap.Anti-slip Inner Grip Strips help prevent brace migration and there is a formfitting hour glass design with superior support for each Hg80 Knee Brace.The Mueller-exclusive HydraCinn fabric is a high-performance, moisture-wicking material with an antimicrobial barrier.