The lightest-weight men's race vest in the award-winning Vapor Series brings an ideal balance of weight, storage capacity, and durability to even the most weight-conscious distance runners. Over-the-shoulder load lifters keep water and gear close to the body for maximum no-bounce comfort, body-mapped, super-breathable materials for maximum comfort, equipped with 2L bladder, two easy-access front bottle pockets, front and side stretch mesh pockets. Wt: 9.3 oz. (w/bladder). S/M: 33" to 39" in chest.|L/XL: 37" to 44" in chest|L/XL: 37" to 44" in chest.