Outdoor Research Helium Rain Jacket Review
The Outdoor Research Helium Rain ($180) is built for one thing: staying out of the way until you really need it. At just over 6 ounces with a minimal feature set, it’s a solid emergency layer for sprinkles or short storms. But breathability is poor, comfort is limited, and the build quality doesn’t inspire long-term confidence. The sticky interior and lack of ventilation make it unbearable for high-output use—or even just sitting still on a humid day. Great for weight-conscious missions, but not a jacket we’d trust in real weather.
Weather Protection
Comfort
Breathability
Weight & Packability
Durability
Sustainability
Waterproofing
2.5-layer Pertex Shield Diamond Fuse
Weight
6.3 oz.
Fabric
30D nylon
Vents
None
Packable
Yes (pocket)
Pros
Cons
Outdoor Research Helium Rain
Editor’s note: For spring 2026, Outdoor Research replaced the Helium Rain with the Helium UL. The newest version features an updated 2.75-layer construction and 15-denier shell, which drop the weight to just 5.7 ounces. It retails for $210. You can read our review of the updated Outdoor Research Helium UL here.
The Outdoor Research Helium Rain sits on the lower end of the spectrum when it comes to full-on weather protection. Built with a 2.5-layer Pertex Shield Diamond Fuse membrane and a thin 30-denier shell, it’s clearly designed for weight savings—not for riding out long, wet storms. The fabric feels delicate compared to standard rain jackets, and while it repels moisture initially, it lacks the confidence and security of burlier, more structured alternatives.
I brought the Outdoor Research Helium Rain on a multi-pitch climb in Leavenworth, WA—where summer storms can roll in fast—and was glad to have it when a brief downpour hit. It shed water for the most part, and my base layer stayed dry, but the interior of the jacket felt damp and clammy afterward. That experience confirmed what the materials suggest: this is best viewed as an emergency shell. It’ll hold up against light rain and brief showers, but for extended exposure, a 2-layer or 3-layer shell with a more robust fabric and membrane (like Gore-Tex) is a better bet.
Comfort is not a strong suit of the Outdoor Research Helium Rain. Its 2.5-layer construction features a plasticky laminate interior that feels sticky and clammy against the skin—especially during movement or in humid conditions. Unlike 3-layer jackets, which typically use a fabric liner to create a softer barrier, the Helium’s interior is bare-bones and not pleasant for next-to-skin wear.
If possible, I’d avoid wearing this rain jacket directly over bare arms, as it tends to cling and trap moisture. The lack of venting options only compounds the issue: there are no pit zips or other ways to dump heat, so things warm up quickly during any kind of sustained activity. It’s manageable for short periods, but not a piece you’ll want to stay in once the skies clear.
The OR Helium Rain is one of the least breathable rain jackets I’ve ever worn. Its 2.5-layer construction lacks any kind of venting—no pit zips, no core vents—and the laminate interior does nothing to wick moisture. Even while sitting still, body heat builds quickly and has nowhere to go, leading to a warm, clammy interior. During any sort of sustained activity, it turns into a sweat trap. For me, this alone is enough to avoid wearing the Helium unless absolutely necessary.
Within the ultralight space, there are far more breathable options that don’t sacrifice weight. The Rab Downpour Light adds only 0.8 ounces and features a supple, textured liner that wicks moisture more effectively. The Montbell Versalite weighs even less than the Helium and still manages to include pit zips and highly breathable fabric. In contrast, the Helium’s breathability limitations are a major downside—especially for a piece intended for fast-and-light travel.
Where the Outdoor Research Helium Rain truly excels is in weight and packability. The women’s version I tested came in at just 6.3 ounces, making it one of the lightest fully waterproof shells on the market. It packs down into its own hand pocket—complete with a carabiner loop for clipping to a harness—and compresses small enough to fit in the palm of your hand. That makes it an excellent backup layer for climbing, mountain running, or fastpacking when space and weight are at a premium.
For reference, the Rab Downpour Light weighs slightly more at 7.1 ounces, while the Montbell Versalite is marginally lighter at 5.8 ounces. Both offer better breathability, but the Helium remains competitive due to its incredibly compact size and streamlined design. It’s a clear standout in this category—larger than a Patagonia Houdini wind shell, but about as packable as a waterproof rain jacket can reasonably get.
With a 30-denier shell and a 2.5-layer construction, the Outdoor Research Helium Rain sits on the fragile end of the rain jacket spectrum. While slightly tougher than ultralight alternatives like the Montbell Versalite (10D) and Rab Downpour Light (20D), the Helium’s thin fabric and laminated interior coating are still prone to wear over time. Like many 2.5-layer jackets, the interior membrane is vulnerable to breakdown with regular use, particularly in areas prone to abrasion or frequent friction. (For more on the topic, see our article on rain jacket layers.)
That said, it does offer a bit more abrasion resistance than some competitors, and I’ve felt comfortable using it while rock climbing—rubbing against granite and rough surfaces that I’d avoid with thinner ultralight shells. Still, the overall build quality leaves room for concern. On my first use, the zipper garage at the hem failed and tore, significantly compromising the jacket’s functionality. I’ve found Outdoor Research gear can be hit-or-miss in quality, and in this case, the Helium Rain feels more like a miss. For occasional, emergency use, it may be passable, but don’t expect it to handle sustained wear or long-term abuse.
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Longevity
Choosing durable outdoor gear and keeping it in use for longer is one of the best ways to reduce environmental impact. Our proprietary longevity rating assesses factors like overall build quality, materials, fabric denier, component durability, and real-world performance. A green check indicates that we expect the product to be long-lasting relative to its peers, a yellow check mark indicates average longevity, and a red X indicates a product that may have a limited lifespan.
PFAS-Free DWR
Durable water-repellent (DWR) finishes can contain PFAS (per- and polyfluoroalkyl substances). These highly persistent “forever chemicals” are used in outdoor gear for their strong resistance to water, oil, and heat, but are linked to environmental contamination and a range of health concerns. A green check mark indicates the product uses a PFAS-free DWR, while a red X means the DWR contains PFAS.
PFAS-Free Waterproof Membrane
The membranes used in waterproof products such as rain jackets, ski jackets, and shoes can contain PFAS (per- and polyfluoroalkyl substances). These highly persistent “forever chemicals” are valued for their resistance to water, oil, and heat, but are linked to environmental contamination and a range of health concerns. A green check mark indicates the product’s waterproof membrane is PFAS-free, while a red X means it contains PFAS.
Recycled Materials
Recycled materials are prevalent in outdoor gear, with nylon, polyester, wool, and down among the most common, but the composition varies widely. A green check mark indicates the product is made with a substantial amount of recycled materials (100% recycled or the core fabric that makes up most of the product is recycled), a yellow check means it contains a moderate to small amount of recycled materials, while a red X means there are no recycled materials in the product.
Bluesign Approved
Bluesign Technologies, based in Switzerland, operates a third-party textile management system that ensures materials are manufactured to strict environmental, chemical, and worker safety standards. A green check mark indicates a product is either a Bluesign Product (contains at least 90% Bluesign-approved fabrics and 20-30% Bluesign-approved accessories) or features a significant amount of Bluesign-approved materials. A yellow check mark means it uses some Bluesign-approved materials but less than the aforementioned category, and a red X means there are no Bluesign-approved materials in the product.
Responsible Manufacturing
This criterion evaluates a brand’s commitment to fair wages, safe working conditions, and reducing environmental impact through certifications and programs like Fair Trade Certified, Fair Wear Foundation, Worldwide Responsible Accredited Production (WRAP), and the Fair Labor Association, while also recognizing brands that manufacture primarily in the U.S. or Europe under strict labor and environmental regulations. A green check mark indicates a brand meets our responsible manufacturing criteria, while a red X means it does not.
Recycled and/or Reduced Packaging
Packaging can add significant waste to outdoor gear purchases, so many brands work to reduce its impact by using recycled materials, incorporating Forest Stewardship Council-certified paper products, and minimizing plastic and paper use. A green check mark indicates a brand uses recycled or reduced materials across all of its packaging, a yellow check indicates moderate or limited use of recycled or reduced packaging, and a red X indicates the brand does not make either of these efforts.
Repair Services
Repair services extend the lifespan of outdoor gear and reduce overall consumption, though programs vary widely. Some brands offer comprehensive repairs for a range of issues, while others provide limited or no repair support. A green check mark indicates a robust repair program, a yellow check mark indicates limited repair services, and a red X indicates the brand does not offer repair services.
Resale and/or Recycling Services
Resale and recycling programs help keep outdoor gear in circulation longer and out of landfills, ranging from trade-in resale platforms that offer store credit to take-back initiatives that recycle products at the end of their usable life. A green check mark indicates a brand offers both resale and recycling programs, a yellow check mark indicates it offers one or the two, and a red X indicates it offers neither.
Carbon Footprint Tracking
This criterion evaluates whether a brand measures, reports, and works to reduce its greenhouse gas emissions using established frameworks such as the Higg Index, Greenhouse Gas Protocol, or The Change Climate Project. A green check mark indicates a brand publicly reports greenhouse gas emissions data, sets clearly defined reduction targets, and uses established tracking frameworks such as Higg or The Change Climate Project. A yellow check mark indicates the brand tracks emissions and outlines reduction goals but provides limited data, lacks science-based verification, or does not clearly report progress. A red X indicates the brand does not appear to track greenhouse gas emissions or provides so little information that its efforts cannot be verified.
Annual Impact Report
Annual impact reports provide transparency and accountability by outlining a brand’s sustainability efforts across areas such as material sourcing, greenhouse gas emissions, waste, water use, supply chains, and packaging. A green check mark indicates a brand publishes a detailed, brand-specific impact report that closely aligns with our sustainability criteria and leaves little room for ambiguity. A yellow check indicates a brand provides some relevant sustainability reporting but lacks detail in key areas or is covered only briefly within a parent company report. A red X indicates a brand does not regularly publish an impact report.
Hood
The Helium Rain features a helmet-compatible hood with a single rear adjustment toggle. It technically fits over a climbing helmet, but movement feels restricted and mobility suffers when cinched. In most situations, I preferred wearing the hood under my helmet for greater range of motion. While it offers decent protection for an emergency shell, it’s not ideal for technical use where freedom of movement matters.
Storage
Storage is basic and, unfortunately, a bit frustrating depending on the version you buy. The women’s model includes two zippered hand pockets, with the left one doubling as a stuff sack. These aren’t compatible with a harness or hipbelt, limiting usability during climbing or fast hiking. In contrast, the men’s Helium Rain includes a single zippered chest pocket (and no hand pockets), which I would have much preferred for trail running or alpine use. A chest pocket is easier to access on the move and more appropriate for this shell’s intended environments. Both versions use Aquaguard zippers for added weather resistance, which operate smoothly and feel well-sealed.
Tester: 5’6” 140 lb.
Size tested: Women’s small
The Outdoor Research Helium Rain has a very trim fit, which makes sense for its role as an emergency layer, but limits its versatility. There’s enough room for a base layer and a slim midlayer—something like a lightweight fleece or a Mountain Hardwear Ghost Whisperer—but it’s a tight squeeze over bulkier insulation like a Patagonia Down Sweater or DAS Light Hoody. If you're hoping to wear this over substantial layers, you'll likely need to size up—or look elsewhere.
The athletic cut helps keep weight and bulk down, and it works well for ultralight missions where minimal layering is expected. That said, the combination of the close fit and clammy-feeling interior puts it out of the running for everyday use in my book. It’s not a jacket I’d want to live in—it’s one I’d pack and hope not to need.
Rab Downpour Light ($165): Ultralight Without the Clammy
For $5 less, the Rab Downpour Light features a similarly lightweight and packable design (it checks in 0.6 oz. heavier than the Helium Rain) with minimal features, a thin shell fabric (20D vs. the Helium’s 30D), and a trim fit. You get two hand pockets with the Downpour Light (compared to the Helium’s one chest pocket) and there’s a big difference in feel: While the Helium Rain is unabashedly clammy and plasticky on the inside, the Downpour Light has a textured backer that’s soft and breathable enough to throw on over a t-shirt. This does mean that the Downpour Light is even less reliable in sustained precipitation, although in reality we wouldn’t want to be caught out in either. If you don’t mind the minor bump in weight and can play it safe with the thinner shell fabric, it’s a much more comfortable ultralight rain jacket than the Helium Rain. For more, read our review of the Downpour Light.
Montbell Versalite ($260): Better Breathability for Serious Ultralighters
If you’re a serious ultralight hiker who plans to venture out no matter the conditions, you’ll want something more breathable than the Helium Rain. Your best bet is the Montbell Versalite, an even lighter alternative (6.4 oz.) that’s equally waterproof (read: enough protection for light showers or intermittent storms), and lightyears more breathable. Whereas the Helium Rain will turn into a sweatshop during sustained activity, the Versalite ventilates well thanks to its air-permeable Gore-Tex Windstopper Infinium shell and pit zips, which are normally unheard of in a jacket of this weight. It’s not nearly as durable (the shell is 10D vs. the Helium Rain’s 30D) and will cost you $90 more, but for seriously weight-conscious hikers and backpackers, the Versalite is unmatched. To learn more, check out our Montbell Versalite review.
The lightest of the light, the Helium Rain is just a bit more jacket than your average windbreaker. We love it as an emergency layer or when light rain is in the forecast, but it has major shortcomings in terms of breathability, fit, and comfort, and will soak through in sustained precipitation.
Weather Protection
Comfort
Breathability
Weight & Packability
Durability
Sustainability
Ideal for summer hikes and short stints up high, the Downpour is an ultralight shell that protects against light rain without much weight and bulk. The stretch-woven shell and soft backer boost mobility, comfort, and breathability. However, due to the lack of pit zips we don’t recommend this jacket for rigorous activity.
Weather Protection
Comfort
Breathability
Weight & Packability
Durability
Sustainability
From Japan-based Montbell comes an impressive ultralight rain jacket that packs in a ton of features at a very low weight. The air-permeable shell and pit zips make it more breathable than the competition. But like all ultralight rain jackets, it wets out in heavy or sustained precipitation, and you’ll want to be careful with the thin shell fabric.
Weather Protection
Comfort
Breathability
Weight & Packability
Durability
Sustainability
Is the Helium Rain for You?
If you need a featherweight emergency shell and prioritize packability above all else, the Outdoor Research Helium Rain fits the bill. It’s ideal for climbers, mountain runners, or fastpackers who want just-in-case protection and are willing to trade breathability, comfort, and features to save weight and space. But if you’re looking for an everyday rain jacket or something for sustained use in wet weather, you’ll want to look elsewhere—this shell is best kept stowed until skies turn dark.
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