NEXT-LEVEL SUPPORT AND STRETCH. The Nike Pro Flex Shorts pair built-in shorts with a stretchy outer layer to keep you supported and moving comfortably. Mesh panels help you stay cool when your workout heats up. Supportive Coverage Built-in shorts have a tight fit to help you feel supported through your routine. Each pair cost $40.00 I only wore the grey pair once and the other two black shorts have never been worn.