Men and women all over the world are finding relief from arm pump, elbow pain and Carpal Tunnel symptoms by using the 4Arm Strong. The 4Arm Strong operates with proprietary, yet simple technology to pin the forearm mucsles in their shortest position, then push them in the opposite direction of the forearm stretch (see inset photos.) This aided stretch is what creates the space needed for relief. Most men will require the 11-13 (28 to 33cm) size option and most women will require the under 11″ (28cm) size option. If you believe you have larger or smaller than average forearms and want to be sure, measure your forearm by following the diagram shown, and choose between the three sizing options.