Perfect for long distance runs, our hydration vest is the ultimate running partner. With storage for all the essentials like your phone, keys, gels and water bottles, there's no stopping you. Chest measurements: S - 38-40 (IN) 96-101 (CM) M - 40-42 (IN) 101-106 (CM) L - 42-44 (IN) 106-111 (CM)