The garment-like fit and special breathable stretch fabric of this bluesign(R)-accredited running hydration vest result in a snug fit with zero bounce. A bungee sternum strap system allows for precision adjustment to the tension and full breathing comfort at all levels of intensity. Modular bungee cords can be used for added compression or to attach items (e.g. poles). There are four easy-access pockets on each shoulder strap and stuff pouches at the back, making this trail running vest well organized and deceptively spacious. Comes with two 500 ml Streamer Flasks LP included. WOMEN MEN Size Chest Size Chest XS 76 cm – 82 cm S 89 cm – 95 cm S 83 cm – 89 cm M 96 cm – 102 cm M 90 cm – 96 cm L 103 cm – 109 cm