It's breathable, easy to stash, and totally waterproof."—Gearhead Expert AlexBuilt with input from our Gearheads, the Backcountry Runoff 2. It keeps us dry with a waterproof Pertex membrane, DWR-treated face fabric, and fully sealed seams. It also keeps us from overheating with high levels of breathability and the added ventilation in the shell's front, back, and sides.