The Men's Vapor Air Hydration Race Vest is Nathan's lightest for weight conscious distance runners. This performance driven vest features super breathable materials that are body mapped for the utmost comfort. Over the shoulder load lifters pull the vest close to your body for bounce free convenience. Nathan included a 2 liter bladder with a quick release valve for easy drinking, and there are two front pockets for extra water bottles. The Vapor Air also features a phone pocket, two front stash pockets, a water resistant pocket, and side stretch mesh pockets that fit most cameras. Reflective details keep you visible in low light.