Experience the ultimate in on-the-go hydration with the Nathan Pinnacle Breeze 4 L Running Vest. Ideal for long-distance running, this running vest features dual-size unisex fit and sternum cord closures with a QuickFit size adjustment system. This allows for micro-size adjustments while on the run, ensuring a perfect, comfortable fit every time. The vest comes equipped with two 14oz QuickStart Soft Flasks for hydration, four front expandable power mesh pockets for easy access storage, and a large back pocket for additional essential items. The design even allows for a 2L bladder in a separate compartment. With reflective details for enhanced visibility in low-light conditions, this running vest makes safety a priority too.