Douglas Pro Arm Restraint limits the range of motion for players suffering from chronic separation and dislocations. Features a multi-grommeted biothane belt, that requires drilling into plastic to attach. Sizing Info: Flexed Bicep Measurement (wrap soft tape measure around flexed bicep) Small: 11"-12" / Medium: 13"-14" / Large: 15"-16" / XL: 17"-18" / 2XL: 19"-20"