Provides support to weak, injured or arthritic joints helps prevent medio-lateral movement of the knee. 4-in-1. 1) provides protective support to knee. 2)helps prevent medio-lateral movement of the knee. 3)provides support to weak, injured, or arthritic joints. 4) dynamic cross straps for targeted support. Flexible steel springs support both sides of the knee. Patented self-adjusting tension straps provide the correct compression and support. Double interior buttress helps support kneecap. Open patella helps prevent slippage. Open back eliminates bunching. Antimicrobial*. Adjustable - one size fits most. Fits left or right knee. Sizing: measure circumference of leg, 3 inches above knee 14.0-20.0in / 35.5-50.8cm. Please recycle. *antimicrobial treatment is intended to protect the brace and does not extend protection to the skin.