Come and Check Our Branding Solutions.This hydration vest backpack is made of nylon and spandex.Come with an adjustable waist strap and high elastic chest strap, Multiple Storage Compartment to store items like cell phones, keys, thin raincoat. Completely chafe free for comfort while running, shorter length delivers a close fit. Breathable and Firmly shape your body without reducing too much volume and slowing down. Wide Apply for Running, Marathon, Cycling, Jogging and so on.size fit most man or female even boys and girls. Customized is available. Pls check inventory and detailed info before placing your orders.