Mammut Keiko Rain Jacket

Staying dry is critical on any adventure, and Mammut’s Keiko rain jacket gets that job done time and time again. The jacket sports DRYtech material: a waterproof and breathable 2.5-layer fabric that successfully warded off wind and rain in the moisture-rich Pacific Northwest. Our tester loved the overall weather-resistance and features of the pack, including the underarm zipper vents and the roomy front pockets. Most of all, she loved the low-profile and compactability of the Keiko, claiming it was easy to throw over an insulating midlayer or stash it in her pack if rain creeped into the forecast. 

Tester Comments:
“I loved most things about the Keiko, it’s a simple, straightforward rain jacket. The only thing I didn’t like was that I had multiple zipper failures—the bottom zipper kept popping out, especially when I needed it most.”

Bottom Line:
This lightweight rain shell from Mammut is a decent option for on-the-go adventurers.