The Flylow Quantum Pro Jacket is a 3-layer hardshell built to hold up on both sides of the rope line. A 20k/20k waterproof breathable membrane and PFAS-free DWR block wind and water through a storm day of tram laps, while the same shell packs down small and layers easily enough to not get punished on a backcountry climb. Fully seam-taped construction and YKK waterproof zippers keep the jacket sealed in a downpour, and seamlines built to move through climbing and descending motion mean the jacket works as hard going up as it does coming down. What Our Gearhead(R) Experts Are Saying:"I wore this through a lift-served storm day and a skin track the next morning without swapping shells, and the 20k membrane kept me dry both times without ever feeling like I was sweating out on the climb."