Okay, so you"re not a superhero. Sometimes you get hurt. That"s why Douglas does what they do. Their CP Arm Restraint features adjustable belts that limit the range of motion for players suffering from chronic separation and dislocations. You can still move, but now your crazy antics on the field won"t stress your shoulder joint. Sizing Details (in inches): S=11-12; M=13-14; L=15-17; XL=18-19.