What Our Gearhead(R) Experts Are Saying:"I trust this shell when the forecast looks ugly. It blocks sustained rain without feeling clammy, and the pit zips make a big difference on steep climbs. The hood and pocket placement work perfectly with a helmet and harness, making it a dependable all-mountain layer."When the weather threatens to shut down our plans, we pull on the Firewall Mountain Jacket and keep moving. Designed by Rab for true all-mountain use, this shell delivers reliable protection for hikes, scrambles, and mountaineering missions where rain, wind, and exposure are part of the deal. Built with 3-layer Pertex(R) Shield, it balances waterproof performance and breathability so we stay dry through persistent drizzle and driving rain. The articulated sleeves move naturally with us on technical terrain, while pit zips help dump heat during hard pushes uphill. A fully adjustable hood with a structured peak shields our face when conditions turn rough, and harness-compatible pockets keep essentials accessible. From shoulder-season storms to year-round mountain travel, this jacket is the shell we reach for when the forecast won't cooperate.