Men's Nike Flex Running Short VERSATILE PERFORMANCE. BREATHABLE COMFORT. Men's Nike Flex Running Short keeps you cool with perforations, an adjustable waist and 5" inseam for comfortable coverage. Nike Flex fabric stretches with your body. Built-in liner offers sweat-wicking comfort. Perforated panels enhance breathability. 5" inseam for coverage that won't inhibit mobility. Zippered pocket on the right-back hip has a vapor barrier to help keep items dry. Hand pockets in the side seams and an additional drop-in pocket at the back-left hip provide extra storage for small items. Elastic waistband with an internal drawcord customizes the fit.