4 pairs gently used Men’s Medium Nike Pro Dri-FIT Flex Vent Max 8" Training Shorts Nike Pro Flex Shorts move with your body through your most intense workouts. An elastic, fold-over waistband lets you easily adjust your fit and the sweat-wicking technology helps you stay dry, so you can zero in on the challenges ahead. This product is made with at least 75% recycled polyester fibers.