Ultra-light materials and a streamlined design make this vest ideal for training and elite-level racing. The vest is made with 3D vent mesh—an 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. The reflective accents, makes you visible on early morning or late-night expeditions.