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.