Shock Doctor CompShor w/BioCup - Boys (White) - Small The Ultra Compression Short is designed for the most discerning athlete looking for peak performance. Its constructed with moisture wicking four-way stretch fabric that moves with your body while eliminating sweat. The mesh cup pocket secures the cup and increases ventilation to improve cooling. The comfort waistband allows you to play without irritation. Our Ultra Cup Retention System integrates an internal Ultra Flex Pocket with flexible retention system designed to position the cup pocket in a more natural position between the legs for a closer, most comfortable fit. Ultra external X-Fit provides even better support and comfortable fit. The ultra comfort fit waistband keeps you comfortable so you can play without distraction.