The Self-Adjusting Knee Stabilizer provides support to weak, injured or arthritic knees. Helps prevent medio-lateral movement (side to side) of the knee. Provides protective support to the knee and supports the knee without compromising performance.. Flexible steel Spring s (2 on each side) help stabilize the knee and control motion. Patented self-adjusting tension straps help provide ideal compression and support for all sizes. Double interior buttress and open patella help support the kneecap while preventing slippage. Open back eliminates bunching for superior comfort. Wraparound design for easy on/off. Fabric treated to prevent odor