Left Size: Xxx-large Thigh Cir. 29.5 -32.5 Recommended For Normalizing Patella Tracking And Helps Reduce Anterior Knee Pain Caused By Patella Instabilities Provides Support For Patella Malalignment Dislocations Or Subluxations Patented Lightweight Material For Added Comfort Aluminum Hinges For Additional Support And To Help Control Hyperextension Easy Application And Adjustment