Rab Firewall Mountain Jacket – Technical Waterproof Mountain Jacket with Pertex® Shield 3L

Description

The Rab Firewall Mountain Jacket is a technical waterproof mountain jacket designed to offer reliable protection on demanding days when rain, wind, and uneven terrain can affect activity. Constructed with Pertex® Shield 3-layer, it combines waterproofing, breathability, and durability in a shell prepared for technical trekking, scrambling, mountain traverses, and prolonged use with a backpack.

Compared to lighter or emergency rain jackets, the Firewall Mountain Jacket offers a more robust and stable construction, with 40D fabric, an adjustable hood designed for bad weather, underarm vents, and a pocket configuration designed to remain functional with a harness or backpack.

It is a jacket for those seeking a serious, durable, and versatile waterproof shell, capable of performing on long routes as well as moderate alpine activity throughout the year.

Real Technical Performance

The Firewall Mountain Jacket sits at a higher level within Rab's waterproof range compared to more compact models like the Downpour Mountain. Its Pertex® Shield 3L construction provides greater protection, better fabric stability, and a more solid feel for frequent mountain use.

The 20,000 mm hydrostatic head allows it to face persistent rain and adverse weather conditions, while the 20,000 g/m²/24 h MVTR breathability helps to wick away moisture during intense activity. The underarm ventilation zippers allow temperature regulation on long climbs, approaches, or days with changes in pace.

Weighing 492 g in size M, it is not an ultralight shell: its value lies in protection, durability, and technical balance for real mountain use. It is a garment particularly suitable for those who prioritize reliability and continuous use over the lightest possible weight.

Quantitative Technical Specifications (Rab Equipment)

• Weight: 492 g / 17.4 oz (size M)
• Center back length: 78 cm / 30.7 in (size M)
• Waterproofness: HH: 20,000 mm
• Breathability: MVTR 20,000 g/m²/24 h
• Main fabric: 40D Pertex® Shield 3-Layer, 133 g/m²
• Outer treatment: Fluorocarbon-free DWR
• Membrane: Pertex® Shield 3-layer waterproof and breathable construction
• Front zipper: YKK® AquaGuard® with chin guard
• Hood: Adjustable, with a sturdy peak and prepared for mountain weather
• Pockets: Two hand pockets and one chest pocket, accessible with a backpack or harness
• Ventilation: Pit zips
• Adjustments: Extended adjustable cuffs and one-hand adjustable hem
• Fit: Regular
• Product code: QWG-9

Comparison within the Range

Within the Rab waterproof collection, the Firewall Mountain Jacket is clearly oriented towards more technical and demanding use than the Downpour Mountain Jacket. The main difference lies in its Pertex® Shield 3-layer construction, which is more robust and prepared for continuous activity.

Compared to the Downpour Mountain Jacket, it offers greater durability, better structure, and a more protective feel in bad weather, albeit with more weight. Compared to the Phantom Mountain Jacket, it is much less minimalist and more suitable for frequent use with a backpack. Compared to a Latok GTX, it is more versatile and accessible for general mountaineering, although it is not focused on the same level of severe alpinism.

It is a very interesting option for those who want a technical mountain shell without reaching the weight, price, or specialization of an extreme alpine hardshell.

Recommended Use

Recommended for technical trekking, demanding mountain hiking, scrambling, alpine traverses, approaches, long routes with a backpack, and year-round outdoor use. It also fits very well as a primary waterproof jacket for users who prioritize resistance and real protection over extreme lightness.

Is it for you?

The Rab Firewall Mountain Jacket is for you if you are looking for a technical, robust, and reliable waterproof mountain jacket, with a 3-layer construction, good ventilation, and details designed for real use with a backpack or harness.

It may not be your best option if you are looking for an ultralight waterproof jacket to carry "just in case," where a Phantom Mountain or a lighter Downpour would make more sense. If your main activity is severe technical alpinism or expeditions in very harsh conditions, you should consider a higher-end shell from the Latok GTX range.