expandable, low-profile waistband pocket to keep your phone secure & safe. Ultra-light, stretch-woven fabric for totally unrestricted movement. Mesh side panels for added ventilation. 4-way stretch construction moves better in every direction . Material wicks sweat & dries really fast . Anti-odor technology prevents the growth of odor-causing microbes. Encased elastic waistband. Mesh hand pockets. Reflective logos for greater visibility on low-light runs. No liner.