The expandable center pocket at the waist is waterproof and keeps your phone safe. Ultra-light stretch fabric for totally unlimited movement. Built-in panties for more coverage and support. 4-Way Stretch technology enables better movement in every direction. The material wicks away sweat and dries very quickly. Laser perforation for better ventilation. Soft knitted belt with built-in back pockets. The Speedpocket front pocket comfortably fits most phones up to 15cm x 7.5cm in size. Leg span: 12.7cm.