Epi-Lock features a unique patented 2 strap system * The strap near the elbow supports deeply buried extensors and works with the forearm strap to provide exceptional support and pain relief * The non-elastic straps are worn comfortably snug * When muscular force is applied  the extensors automatically enlarge  causing the straps to tighten * Universal left or right * Measure forearm circumference for sizing * Fits 12  - 15  circumference * HCPC: NOT COVERED