• Soft, Lightweight and Breathable The body fabric is made of soft, flexible 100% recycled polyester ripstop with mechanical stretch and a durable water repellent (DWR) finish made without perfluorinated chemicals (PFCs/PFAS); the back is made of an airy, high-flex monofilament mesh for breathability, cooling airflow and next-to-skin comfort Low-Profile Stretch Pockets Low-profile, water bottle-friendly stretch pockets on the vest’s front fit a variety of flasks and bottles for instant access Trekking Pole Carry Two sets of elastic loops hold trekking poles: one sits on the front of the pack for quick-stash access, the other is across the lower back for out-of-the-way storage Monomesh Back Panel Hydrophobic monomesh back panel provides maximum airflow and all-day comfort HydraPak® Flasks Two 500-milliliter HydraPak® flasks are included