Rab Phantom Mountain Jacket | Ultralight 20K/20K Waterproof Mountain Jacket

Recommended use

• Fast hiking and light trekking
• Fast mountaineering and active mountain sports
• Premium emergency waterproof shell
• Routes where backpack space is very limited

Is it for you?

• ✔ Yes, if you are looking for an ultralight and highly packable waterproof jacket for the mountains.
• ✔ Yes, if you engage in fast-paced activity and want a serious shell that takes up almost no space.
• ✔ Yes, if you prioritize minimum weight without sacrificing real 20K/20K protection.
• ✘ No, if you need a more robust jacket for prolonged use and very severe conditions over several days.
• ✘ No, if you are looking for a more comfortable, structured, or versatile shell for continuous use outside of fast mountain activities.

Description

The Rab Phantom Mountain Jacket is an ultralight waterproof jacket designed for moving fast in the mountains, when backpack space and total gear weight are decisive factors. It does not aim to compete in robustness with a heavy shell for continuous use, but rather to offer real, compact, and serious protection for fast days, technical trekking, fast hiking, and alpine outings where it is convenient to carry a reliable waterproof layer without penalizing your load.

Its approach is clear: a shell with minimal weight, maximum compressibility, and 20,000/20,000 protection, designed to stay in your backpack until the weather truly changes.

Real technical performance

At only 222g in size M, the Phantom Mountain Jacket fits into a very specific category within Rab: waterproof garments that prioritize speed, lightness, and ease of transport. The 30D Pertex® Shield 2.5-Layer fabric with Diamond Fuse technology provides a very interesting combination of low weight and higher abrasion resistance than other thinner fabrics oriented solely toward gram-counting.

Its ratings of 20,000 mm waterproofness and 20,000 g/m²/24h breathability place it at a technical level fully valid for the mountains. In real-world use, it works especially well as a waterproof layer for intense activity, sudden weather changes, and traverses where you need a shell you can always keep in your pack without thinking twice.

The value of this model lies in its balance: it is light, very compact, and technical enough for demanding mountains, but without becoming a heavy or oversized garment for those who prioritize speed and efficiency.

Description

The full-length front zipper allows for quick on-and-off when the weather changes, while the lightweight, minimalist-adjust hood with a reinforced peak adds extra protection without adding unnecessary bulk. The articulated sleeve design promotes mobility, and the two lightweight hand pockets keep essentials close at hand.

Furthermore, it can be stowed into its own hood, which reinforces its role as a high-level emergency shell to always carry with you on fast routes, trekking, or light alpine activities.

Comparison within the range

• Versus Downpour Mountain Jacket: the Phantom Mountain is notably lighter and more compact, more oriented toward fast activity and carrying in a backpack at all times.
• Versus Firewall Light Jacket: maintains a lightweight philosophy, but with an even more minimalist and portable focus.
• Versus a more robust mountain shell: prioritizes weight and compressibility over structural comfort or durability for continuous use over several days in bad weather.

Quantitative technical specifications (Rab Equipment)

• Fit: Regular
• Weight: 222 g / 7.8 oz (size M)
• Center back length: 75 cm / 29.5 in (size M)
• Waterproofness: 20,000 mm
• Breathability: 20,000 g/m²/24h
• Main fabric: 30D Pertex® Shield 2.5-Layer with Diamond Fuse, fluorocarbon-free DWR, 73 g/m²
• Product code: QWI-71
• Key features: packable into hood, lightweight hood with minimalist adjustment, articulated sleeves, two lightweight hand pockets, elasticated cuffs, and low-profile rear hem adjustment