Expandable center-front waistband pocket is water-resistant & keeps your phone secure, with no bouncing Ultra-light, stretch-woven fabric for totally unrestricted movement Built-in brief for added coverage & support 4-way stretch material moves better in every direction Strategic laser perforations for added ventilation Material wicks sweat & dries really fast Ultra-comfortable, soft knit waistband with built-in, secure zip back pocket Side-vent hem