Firewall Mountain 3L Jacket

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Tough, weather-ready and breathable enough for year-round mountain use.

Rab says: 

The Firewall Mountain Jacket comes into its own when the forecast threatens to disrupt your plans. Fully featured and highly protective, it uses 3-layer Pertex® Shield to deflect persistent drizzle and torrential rain, so you can keep exploring unfazed. Equipped for year-round hikes, scrambles, and mountaineering, the Firewall Mountain Jacket is a true all-mountain shell.

Our Verdict

A dependable mountain shell that’s built to take a battering, made for wet, cold, and high places where you need your kit to work hard.

The updated Rab Firewall Mountain 3L Jacket is a solid performer in prolonged foul weather. At 521g for a Medium, it’s on the heavier side for a waterproof shell, but it earns its keep with durable construction and a well-thought-out feature set. The Pertex Shield 3-layer fabric offers trustworthy waterproofing and doesn’t feel plasticky against the skin, even during long stints on the move.

The helmet-compatible hood adjusts easily, and the peak holds its shape well in the wind. The pit zips are generous, helping dump heat fast without unzipping the front. I found the articulated sleeves and overall cut comfortable, with room for layers underneath without feeling oversized.

– Reviewed by Ultralight Outdoor Gear

Features

• 2-way adjustable hood with concealed internal cord locks and single handed adjustment with stiffened flexible polymer peak for added protection
• YKK® AquaGuard® centre front zip with chin guard for comfort
• YKK® AquaGuard® pit zips for efficient core ventilation
• Fully articulated sleeves for improved fit and comfort
• 2 YKK® AquaGuard® zipped A-line pockets
• Extended cuffs with hook and loop adjustment for fit with gloves or mitts
• Dual sided rear hem adjustment with single handed adjustment

Specifications

• Small weighs: 497g
• Medium weighs: 521g
• Large weighs: 542g
• Fit: Regular: 562g
• Centre back length (Size M): 78 cm/30.7 inch

Material & Construction

• 40D Pertex® Shield 3-Layer construction waterproof technology with fluorocarbon-free DWR (133gsm) HH: 20,000mm/MVTR: 20,000 g/m2/24hrs
• Main Body: 100% Polyamide (Recycled) with Polyurethane membrane, Reverse: 100% Polyamide

Help & advice:

• Pertex Shield Technology Explained
• Time-Saver Guide to Choosing a Waterproof Jacket
• Time-Saver Guide to PFC Free
• About Rab
• Choosing a Waterproof Jacket
• MVTR Breathability
• Hydrostatic Head
• Rab Sustainability and Responsibility