A dream for ultra-long distance runners and fast-packers, Zephyr Vest is engineered with body mapping for optimal ventilation and designed to perform for your specific pursuit. It's lightweight and maxed out with safety features. There's a secure cell phone pocket, built-in safety whistle, and attachment point for your trekking poles. Hydration at the ready with two Quick Stow flasks at the front of your vest for easy access. And since you're always on the run, the ultra lightweight material is treated with Polygiene antimicrobial to keep bacteria at bay from one stretch to the next.