Tough, streamlined, and built for serious weather, these trousers are ideal for big mountain days when performance matters more than weight.Rab says:When youre heading up high in a bleak forecast, these highly protective waterproof pants are an essential item in your pack. Constructed with hardwearing, breathable 3-layerPertex Shield, theyre all about durability, offering the rugged protection you need when a storm batters the mountainside. With a side zip so you can deploy them quickly when the heavens open, and superb articulation for total freedom of movement on mountain hikes and multi-day treks.Our VerdictThe Rab Firewall Mountain 3L Pants are an impressive combination of protection, function, and fit. At 312g (UK12), theyre light for a full-spec shell trouser, and the 3-layer Pertex Shield fabric feels durable and breathable. The full-length side zips use triple pullers, meaning they can get over boots and help with ventilation during climbs.The cut is generous enough to layer over baselayers or trousers, but not baggy. Articulated knees and a long gusset make movement feel unhindered on steeper ground. I found the waistband comfortable and stable under a pack, though the absence of pockets does limit quick-access storage.- Reviewed by Ultralight Outdoor GearFeatures3/4 length YKK side zips with internal storm guard and triple pullersElasticated waistband with elastic and drawcord adjustmentDrawcord adjustable hem to accommodate different footwearLong length gusset and knee articulation for ease of movementSpecificationsUK 8 weighs: 289gUK 10 weighs: 299gUK 12 weighs: 312gUK 14 weighs: 323gMaterial & Construction40D Pertex Shield 3-Layer construction waterproof technology with fluorocarbon-free DWR (148gsm) HH: 20,000mm/MVTR: 20,000 g/m2/24hrs100% Polyamide (Recycled) with Polyurethane membrane Reverse: 100% PolyamideHelp & advice:Pertex Shield Technology ExplainedAbout RabChoosing a Waterproof JacketMVTR BreathabilityHydrostatic HeadRab Sustainability and Responsibility

Tough, streamlined, and built for serious weather, these trousers are ideal for big mountain days when performance matters more than weight.Rab says:When youre heading up high in a bleak forecast, these hi