Ultra-light materials and a streamlined design make this vest ideal for long-distance training and elite-level racing. Available in multiple sizes and equipped with two Quick Stow flasks, the Ultra Pro vest puts comfort above all else. The vest is made with 3D vent meshan ultralight material that guarantees maximum airflow on sweaty runs. It also offers plenty of front storage pockets for easy access to fuel, water or salt tabs, along with a secure zippered pocket that fits most smartphones. The back features several stretch pockets that can store extra layers on cold days, but also accommodates an additional reservoir for longer self-supported runs. Weve also added reflective accents throughout, so youll always be visible on early morning or late-night expeditions.