MSRP: $495.00
In an outdoor market full of insulated jackets, choosing the right one for the day can be surprisingly difficult. As an ice climbing and ski guide in Montana, my priorities are simple: stay warm in sub-zero temperatures and wear gear that can withstand daily abuse. My jackets are subjected to the wear that comes with loading and unloading oily snowmachines, scraping against ice and rock, and long days in harsh conditions. When I first received Rab’s Positron Pro, I was skeptical about trusting a new parka for such an important role in my layering system.
After more than 20 guiding days and personal missions, that skepticism disappeared. The Positron Pro became one of my go-to jackets. I used it for multipitch ice climbing, instructional days, snowmobiling, winter camping, backcountry skiing and even wearing around town. Most impressive was how well it handled the abuse—despite regular snow machine use and constant packing and unpacking, it showed virtually no signs of wear.
The Positron Pro is built using 800-fill hydrophobic down, delivering 6000m-level warmth and expedition durability. A size medium weighs 788 grams (1.7lbs), giving it a reassuring heft that inspires confidence when temperatures drop. The Pertex Quantum Pro shell fabric provides excellent durability and weather resistance, shrugging off light moisture while standing up to abrasion far better than many ultralight down jackets. The thoughtfully designed baffle layout keeps the insulation evenly distributed, eliminating cold spots and maintaining warmth even during long periods of inactivity.
Rab also packed this jacket with practical features that I appreciated every day. Six pockets provide plenty of storage for gloves, goggles, skins, and other essentials. The handwarmer pockets are lined and genuinely comfortable on cold mornings, and they are thoughtfully placed above the height of a harness’ waistbelt. A heavy-duty two-way front zipper is backed up by a snap closure beneath it for extra security. The helmet-compatible hood fits comfortably over a climbing helmet without feeling oversized. The incorporated stuff sack pocket makes packing the jacket straightforward when it’s not needed. Fit is another highlight, striking an excellent balance between athletic and roomy; it’s trim enough that it doesn’t snag while climbing or moving through tight terrain, yet spacious enough to comfortably layer over multiple insulating pieces during the coldest days.
I tested the jacket in black, which I appreciated for everyday use both in the mountains and around town. For men, Rab also offers a high-visibility red for those prioritizing visibility in alpine terrain, along with a tasteful blue option for a more understated look. For women, blue and black options are available.
The primary tradeoff for the Positron Pro’s durability and extra features is weight, which for some may seem negligible and for others, significant. Compare Rab’s Positron Pro at 788 grams (27.8 ounces) to their Mythic Ultra Down Jacket at 537 grams (18.9 ounces). One will definitely notice this difference if counting every gram when preparing for fast alpine missions, as well as the size that the jacket packs down to. However, the additional weight brings noticeably greater durability, more features, and a jacket that feels built for years of hard use rather than occasional outings. When standing around at cold winter belays in Hyalite Canyon, Silverton, or North Conway and handling your own sharp items as well as being around others with theirs, a more solidly built overcoat is really nice to have. When the cold-proof puffy will mostly stay stuffed in the pack as a backup or pulled out at rest breaks on the trail, the Mythic may be a better option.
Overall, the Positron Pro stands out as one of the warmest jackets in its class and represents outstanding value considering its build-quality, materials, durability, and feature set. It’s an expedition-worthy parka that excels on extended trips, long winter workdays, and demanding alpine objectives. If I were choosing one down parka to own for years of guiding, climbing, winter camping, or even an off-summer objective like El Capitan, this would be high on my list. This jacket is comfortable, durable, thoughtfully designed and, most importantly, it consistently kept me warm when it mattered most.
If you’re shopping for the lightest possible down jacket, there are better choices. But if you’re looking for a dependable workhorse that will survive years of real mountain use while keeping you exceptionally warm, and at a price that’s difficult to beat for the quality, the Rab Positron Pro is an outstanding choice.
Pros: very warm, comfortable in negative temps, marketed for 6000m peaks, windproof, durable, robust pockets with soft-to-touch material, treated down with high fill and water-resistant fabric, thoughtful design features, helmet compatible hood, double zipper with button, built in stuff-it pocket, reasonably priced
Cons: heavier than ultralight options
Akio Joy is an IFMGA Mountain Guide and a member of the AMGA Instructor Team, based in Red Lodge, Montana. His professional focus is in climbing, skiing, and technical mountain instruction. He is a co-owner of Beartooth Mountain Guides, where his work emphasizes high-level instruction, mentorship, and a critical, systems-based approach to mountain guiding and performance. Find Akio on social media at @akiojoy or learn more at beartoothguides.com.