Outdoor Research Helium Ii Jacket

Finding Your Perfect Weather Shield on the Trail and Beyond

When it comes to battling the elements while keeping your pack weight down, few pieces of outdoor gear strike the perfect balance between protection and packability like the Outdoor Research Helium II Jacket. After years of testing countless rain shells on trails from the Pacific Crest to the Appalachians, I’ve developed a keen eye for what works when Mother Nature decides to unleash her fury. Today, I’m sharing my comprehensive breakdown of this ultralight marvel that’s become a staple in my adventure kit.

I still remember the first time I pulled my Helium II from its tiny pocket during an unexpected cloudburst on the Olympic Peninsula. As the heavens opened and fellow hikers scrambled for cover, I deployed this minimalist shield in seconds, watching raindrops bead and roll off the surface while I continued along the trail. That moment cemented my appreciation for thoughtful design that doesn’t compromise on performance.

Whether you’re a dedicated thru-hiker counting every ounce or a weekend warrior who wants reliable protection without the bulk, this guide will help you determine if the Helium II deserves a spot in your pack. Let’s dive into what makes this jacket special, where it excels, where it falls short, and how it compares to alternatives on the market.

The Evolution of Lightweight Protection

The original Helium jacket marked Outdoor Research’s entry into the ultralight rain shell category, but the Helium II represented a significant leap forward in the pursuit of the perfect balance between weight and functionality. I’ve watched this evolution closely, having owned both generations, and the improvements are tangible.

Outdoor Research didn’t just create another rain jacket; they engineered a solution for outdoor enthusiasts who refuse to be weighed down by their gear. The philosophy behind the Helium series has always been clear: provide essential protection without unnecessary features that add bulk. This minimalist approach runs counter to the feature-rich jackets that dominate much of the outdoor market, and it’s precisely this focused design that makes the Helium II so appealing.

As ultralight backpacking and fast-and-light alpine missions gained popularity, the need for genuinely lightweight weather protection became more pronounced. The Helium II emerged as a response to this growing demand, carving out a niche for itself among those who count every gram but still need dependable shelter from the elements.

Technical Specifications: Breaking Down the Basics

Before delving into performance, let’s establish what we’re working with. The Outdoor Research Helium II is a minimalist rain jacket that weighs a mere 6.4 ounces (181 grams) for a men’s medium—about the same as two energy bars. This featherweight construction makes it one of the lightest fully-functional rain jackets available.

The secret to its lightness lies in the materials. Outdoor Research constructs the Helium II using Pertex® Shield+ 2.5L waterproof fabric, which consists of an outer nylon ripstop layer bonded to a waterproof breathable membrane, with a protective interior coating rather than a full fabric liner (hence the “2.5 layer” designation).

Key specifications include:

• Weight: 6.4 oz (181g) for men’s medium
• Materials: Pertex® Shield+ 2.5L, 30D nylon ripstop
• Waterproofing: 20,000mm
• Breathability: 20,000g/m²/24hrs
• Packed size: Approximately the size of a large apple
• Hood: Adjustable, with a rear cinch
• Pockets: One napoleon chest pocket (which doubles as the stuff sack)
• Cuffs: Elastic
• Hem: Adjustable with drawcord
• YKK® AquaGuard® zippers with storm flaps

The jacket’s design is intentionally spartan, eliminating hand pockets, pit zips, and other features that would add weight. This focused approach yields a jacket that disappears in your pack until the moment you need it.

Waterproofing and Weather Resistance: How Dry Will You Stay?

Let me be clear about expectations: the Helium II is waterproof, not water-resistant. With a 20,000mm waterproof rating, it’s designed to handle sustained precipitation. However, in my experience, there’s nuance to this performance that deserves unpacking.

During light to moderate rainfall lasting under a few hours, the Helium II performs admirably. Water beads effectively on the surface, and the DWR (Durable Water Repellent) coating causes droplets to roll off rather than saturating the fabric. The fully-taped seams prevent leakage at construction points, and the YKK AquaGuard zippers offer good protection against water ingress.

Where the jacket begins to show its limitations is in prolonged, heavy downpours. After several hours of consistent rain, I’ve noticed that the fabric can begin to wet out—the DWR becomes overwhelmed, and the outer fabric layer saturates. While the membrane underneath continues to prevent water from reaching your base layers, this saturation reduces breathability and creates a clammy feeling against the skin.

It’s worth noting that this limitation isn’t unique to the Helium II. Even premium hardshells costing three times as much will eventually face similar challenges, though they typically take longer to reach that point. The difference is in your expectations: the Helium II is an emergency shell and light precipitation barrier, not an expedition-grade monsoon jacket.

Wind protection is another area where this jacket shines. The tightly woven ripstop nylon effectively blocks wind, making it excellent for ridge traverses and exposed summits. I’ve relied on it as a wind shell in cold, dry conditions just as often as I’ve deployed it against rain.

Breathability: Finding the Balance

Breathability often represents the greatest challenge in waterproof garment design. Creating a barrier that prevents water droplets from entering while allowing water vapor from sweat to escape requires sophisticated material technology. The Helium II’s 20,000g/m²/24hrs breathability rating is respectable, especially considering its price point and weight.

In practice, I’ve found the breathability adequate during moderate activity levels in cool conditions. While hiking at a reasonable pace in temperatures below 60°F (15°C), the jacket manages moisture well enough to prevent significant condensation inside. The key word here is “reasonable”—once you start working hard, pushing uphill with a heavy pack, or hiking in warmer conditions, no fully waterproof jacket at this weight will keep pace with your perspiration.

The absence of pit zips or venting options means you’re entirely reliant on the fabric’s inherent breathability for moisture management. This is clearly a weight-saving design decision, and it makes sense given the jacket’s intended use case as an emergency shell rather than an all-day rain garment.

I’ve developed a few strategies to optimize comfort when using the Helium II during higher-exertion activities:

1. Proactively manage your layers—don’t wait until you’re overheating to remove insulation beneath the shell
2. Periodically unzip the front when conditions permit to allow for manual venting
3. Adjust your pace to your environment—sometimes slowing down slightly prevents overheating
4. When possible, time your high-intensity efforts during breaks in the precipitation

Fit and Comfort: Room to Move

Outdoor Research has struck a thoughtful balance with the Helium II’s fit—not too athletic to restrict movement or layering, yet not so baggy that it becomes a flapping sail in windy conditions. I’d describe it as a regular fit with enough room for a midweight fleece or light puffy underneath.

The articulation in the arms allows for overhead reaching without significant hem lift, making it suitable for activities beyond just hiking—I’ve comfortably worn mine while scrambling, cycling, and even cross-country skiing. The elastic cuffs are simple but effective, creating a seal around your wrists without being overly tight or requiring adjustment.

The hood deserves special mention. It’s adjustable via a single rear cinch cord, which creates a surprising amount of customization for such a minimal design. When fully tightened, it moves with your head rather than blocking peripheral vision. The small stiffened brim helps direct water away from your face—not quite as effectively as jackets with wire-reinforced brims, but adequate for most conditions.

One comfort consideration is the interior feel of the 2.5-layer construction. Without a full fabric liner, the protective coating can feel slightly clingy against bare skin, especially when you’re sweating. This is a common characteristic of lightweight 2.5L jackets and represents another trade-off for the weight savings. Wearing a light long-sleeve base layer eliminates this issue entirely.

Durability: Defying Its Featherweight Status

When I first held the Helium II, its gossamer-thin fabric raised immediate durability concerns. How could something so light possibly stand up to brush, rock abrasion, and the general abuse of backcountry travel? Years later, I can report that the jacket has proven surprisingly resilient, with some important caveats.

The 30-denier nylon ripstop fabric offers more tear resistance than its weight would suggest. The ripstop grid provides reinforcement that prevents small tears from propagating into larger ones—a critical feature for ultralight gear. I’ve scraped against granite while scrambling and pushed through thick underbrush without catastrophic damage.

That said, this isn’t a jacket designed for bushwhacking through thorny vegetation or extended use under a heavy backpack. The thin fabric will eventually show wear points where pack straps consistently rub, and direct abrasion against rough surfaces will take its toll faster than on heavier jackets.

The most vulnerable points tend to be:

1. Shoulders and hipbelt areas where backpack straps create friction
2. Forearms when pushing through dense vegetation
3. Cuffs, which naturally see more contact with external surfaces

The DWR coating, like all such treatments, requires periodic maintenance to maintain optimal performance. After about 10-15 days of use (or sooner if the jacket starts to wet out quickly), you’ll want to revitalize the DWR. This can be done through careful washing followed by low-heat tumble drying or with spray-on DWR refresher products.

Packability: Disappearing Act

If there’s one area where the Helium II is truly exceptional, it’s packability. This jacket compresses to about the size of a large apple, thanks to its thoughtfully designed stuff pocket. The left chest pocket reverses to become a stuff sack, complete with a carabiner loop for attaching to your harness or pack.

The packed size has practical implications beyond just saving space. It means there’s virtually no excuse to leave the jacket behind, even on trips where precipitation seems unlikely. The minimal weight penalty means I often bring it purely as an insurance policy or wind layer. It’s also small enough to keep in a daypack, commuting bag, or even a large jacket pocket for daily life.

This disappearing act is perhaps the Helium II’s most compelling feature. Other jackets might perform marginally better in specific categories, but few can match the combination of decent protection and microscopic packed size. For fast-and-light missions where every cubic inch of pack space matters, this advantage becomes significant.

The Helium II vs. Helium III: Evolution or Revolution?

Outdoor Research has since released the Helium III, which naturally raises questions about how it compares to its predecessor. Having spent time with both jackets, I can offer some perspective on the differences.

The Helium III incorporates several design changes while maintaining the same ultralight philosophy. Key differences include:

1. Slightly increased weight (about 6.8 oz vs 6.4 oz for men’s medium)
2. Addition of hand pockets (a welcome feature for everyday usability)
3. Updated hood design with improved peripheral vision
4. Modified fit with slightly more room in the torso
5. Refreshed color options
6. Minor improvements to the waterproof fabric technology

Are these changes worth upgrading for if you already own a functional Helium II? In my assessment, probably not. The core performance characteristics remain very similar, and the slightly increased weight, while still impressively light, does sacrifice the Helium II’s claim to being among the very lightest fully-functional rain jackets available.

However, for new purchasers, the decision is more nuanced. If you value hand pockets and don’t mind the slight weight penalty, the Helium III offers improved everyday functionality. If you’re a dedicated ultralighter or weight-conscious climber, the original Helium II might still be preferable if you can find it (though inventory is becoming increasingly limited as the newer model takes over).

Color Options and Style Considerations

While performance typically takes precedence over aesthetics in technical outerwear, appearance still matters to most users. The Helium II has traditionally been offered in a range of colors from subdued earth tones to brighter options for visibility.

Common color options have included:

• Pewter/Alloy (a neutral gray)
• Baltic/Glacier (blue variants)
• Hot Sauce/Tomato (red variants)
• Lemongrass/Citron (yellow-green variants)
• Black
• Various seasonal special colors

The clean, minimalist design avoids excessive logos or contrast features, giving it a streamlined look that works well both on the trail and for urban use during inclement weather. The single chest pocket and lack of extraneous details contribute to a sleek silhouette that doesn’t immediately scream “technical outdoor gear” in casual settings.

One consideration worth mentioning: lighter colors show dirt more readily, and the thin fabric can occasionally be slightly translucent in bright sunlight. If you’re concerned about either of these factors, opting for a darker color might be preferable.

Care and Maintenance: Extending Lifespan

Proper care significantly impacts the performance longevity of any waterproof breathable garment, and the Helium II is no exception. The good news is that maintenance is straightforward if you follow a few key principles.

For regular cleaning:

1. Close all zippers and fasteners
2. Machine wash on gentle cycle with warm water
3. Use technical wash specifically designed for waterproof garments (like Nikwax Tech Wash or Grangers Performance Wash)
4. Avoid regular detergents, fabric softeners, or bleach, which can damage the DWR coating and membrane
5. Rinse thoroughly
6. Tumble dry on low heat to reactivate the DWR coating, or apply a spray-on DWR refresher and then tumble dry

When storing the jacket for extended periods, keep it uncompressed in a cool, dry place. While the stuff pocket is convenient for packing, leaving the jacket stuffed for months can stress the fabric unnecessarily.

For small tears or punctures, Tenacious Tape or similar repair products work well as field fixes and can become semi-permanent solutions with proper application. For more significant damage, Outdoor Research offers a lifetime warranty (their “Infinite Guarantee”) that covers defects in materials and workmanship.

Price Considerations: Value Analysis

The Outdoor Research Helium II typically retails in the $159-$179 range, positioning it in the mid-tier of ultralight rain jackets. Sales and closeouts can occasionally bring this down to around $120-$140, which represents excellent value for the performance.

When evaluating this price point, it’s worth considering both cheaper and more expensive alternatives:

• Budget ultralight jackets ($70-120) often sacrifice significantly in material quality, resulting in faster wetout times and shorter lifespans
• Premium ultralight options ($200-300) offer incremental improvements in breathability and durability, but rarely dramatic enough to justify doubling the price for most users
• Traditional rain jackets with more features ($150-250) provide additional pockets and venting options but at a significant weight penalty

In my assessment, the Helium II hits a sweet spot for value, delivering 80-90% of the performance of premium ultralight options at a substantially lower price point. For anyone serious about lightweight backpacking, alpine climbing, or adventure travel, the investment is easily justified by the functionality per ounce and cubic inch of pack space.

Real-World Applications: Where Does It Excel?

Understanding the intended use cases for the Helium II helps set appropriate expectations. Based on extensive personal use and conversations with other outdoor enthusiasts, here are the scenarios where this jacket truly shines:

Hiking and Backpacking

The ultralight design makes the Helium II ideal for backcountry travel where every ounce counts. It serves perfectly as an emergency shell that can live in your pack for days without notice, then deploy quickly when weather turns. For weekend trips with decent weather forecasts or longer treks with occasional precipitation, it’s nearly perfect.

Climbing and Mountaineering

Weight and packability are paramount concerns for climbers. The Helium II’s compact size means it can clip to a harness or stuff into a small summit pack without becoming a burden. The minimalist hood fits under a helmet, and the athletic cut doesn’t inhibit movement on technical terrain. For alpine rock routes with uncertain weather, it provides just enough protection without weighing you down.

Bike Commuting and Cycle Touring

While not cycling-specific, the Helium II works surprisingly well on two wheels. The trim fit minimizes flapping in the wind, and the chest pocket remains accessible even with a backpack. The packability means it’s easy to always have on hand for surprise showers during your commute. The main limitation for dedicated cyclists is the lack of a dropped tail to protect from wheel spray.

Travel

Few items earn a permanent spot in my travel kit across all destinations, but the Helium II is one of them. It occupies negligible space in a carry-on, serves as wind protection in cool evenings, and provides genuine rain protection when needed. The simple design blends in across cultures and environments without screaming “technical outdoor gear.”

Running

While not designed specifically for runners, the lightweight construction makes it viable for trail running in changeable conditions. The breathability limitations become more apparent during high-output activities, but for cool-weather running with light precipitation, it can work well as an outer layer.

Where It Falls Short: Limitations to Consider

No piece of gear is perfect for all situations, and the Helium II has clear limitations that stem from its ultralight design priorities:

Extended Heavy Precipitation

For multi-day trips in consistently wet climates like the Pacific Northwest during shoulder seasons or tropical destinations during monsoon periods, the Helium II’s minimal design can become a liability. The lack of venting options and the tendency for the fabric to wet out in prolonged downpours make it suboptimal for these conditions.

Extreme Cold Weather

While effective as a wind barrier, the minimalist design offers limited insulation value. In very cold conditions, shells with more substantial face fabrics provide additional warmth. The simple elastic cuffs also don’t seal as effectively as adjustable cuffs when worn with heavy gloves.

Durability for Rough Use

Activities that involve significant abrasion—dense bushwhacking, canyoneering, or pack-heavy expeditions—will accelerate wear on the lightweight materials. For these scenarios, a jacket with reinforced wear points and heavier fabrics makes more sense despite the weight penalty.

Breathability for High-Output Activities

The absence of mechanical venting (pit zips, core vents, two-way zippers) means the Helium II relies entirely on its membrane for moisture management. During high-exertion activities, especially in warmer conditions, this can result in internal condensation and a clammy feeling.

Sustainability Considerations

Environmental impact has become an increasingly important factor in gear purchases, and it’s worth examining the Helium II through this lens. While Outdoor Research doesn’t market the Helium II specifically as an eco-friendly product, several aspects merit consideration:

The jacket’s minimalist design inherently requires fewer raw materials than more feature-rich alternatives. Its durability, despite the lightweight construction, means it doesn’t need frequent replacement, reducing consumption over time. The relatively simple construction also means fewer components that might fail and render the entire jacket unusable.

On the less positive side, the DWR treatment traditionally used on waterproof fabrics contains PFCs (perfluorinated compounds), which have raised environmental concerns. Many manufacturers, including Outdoor Research, have been transitioning toward non-PFC DWR treatments, though this transition has been gradual across the industry.

The jacket’s repairability is reasonable for small damages using commercially available repair tapes and patches. For more significant issues, Outdoor Research’s warranty program can extend the product’s usable life rather than necessitating replacement.

Competitor Comparison: How Does It Stack Up?

The ultralight rain jacket category has become increasingly competitive, with numerous worthy alternatives to consider alongside the Helium II. Here’s how it compares to some notable competitors:

Patagonia Storm10 Jacket

• Slightly heavier (8.3 oz vs 6.4 oz)
• More durable face fabric
• Better long-term DWR performance
• Higher price point ($299 vs $159-179)
• Similar packability
• Better breathability

Montbell Versalite

• Similar weight (6.4 oz)
• Includes pit zips for venting
• Hand pockets
• Comparable price
• Slightly less durable construction
• Similar waterproofing performance

Arc’teryx Norvan SL

• Comparable weight (6.5 oz)
• Significantly more expensive ($325+)
• Similar minimal feature set
• Proprietary ShakeDry technology eliminates the need for DWR
• Cannot be worn with a backpack (manufacturer recommendation)
• Superior breathability

REI Co-op Drypoint GTX

• Heavier (10.5 oz)
• More features (hand pockets, more adjustments)
• More durable construction
• GORE-TEX Active membrane
• Better long-term waterproofing in sustained precipitation
• Less packable

The Helium II generally wins on the weight-to-performance ratio and value proposition but loses in specific categories like feature set, absolute waterproofness in extended precipitation, and breathability during high-output activities. Your priority hierarchy will determine which trade-offs make the most sense for your needs.

User Reviews and Community Feedback

I’ve been monitoring user reviews and outdoor community discussions about the Helium II for years, and a clear consensus emerges. The jacket receives particularly high praise from:

• Thru-hikers on long-distance trails like the PCT, AT, and CDT
• Ultralight backpackers and alpinists
• Budget-conscious outdoor enthusiasts seeking performance without premium pricing

Common points of positive feedback include:

“The weight-to-protection ratio is unbeatable.”
“Packs down so small I forget it’s there until I need it.”
“Has saved me multiple times when unexpected weather rolled in.”
“Surprisingly durable for how light it feels.”

Recurring criticisms typically focus on:

“Wets out faster than expected in heavy, sustained rain.”
“Breathability isn’t sufficient for high-exertion activities.”
“Lacks hand pockets for everyday use.”
“Clammy feeling against the skin when working hard.”

These diverse perspectives reinforce my own assessment: the Helium II excels as a lightweight emergency shell and occasional-use rain jacket, but has limitations for extended wear in severe conditions.

Where to Buy: Finding the Best Deal

The Outdoor Research Helium II is widely available through multiple retail channels. While pricing remains fairly consistent across platforms due to manufacturer policies, sales timing can vary significantly.

Major retailers carrying the Helium II include:

• Outdoor Research’s direct website
• REI
• Backcountry
• Moosejaw
• Amazon
• Local specialty outdoor retailers

The best values typically come during seasonal transitions (late winter/early spring and late summer/early fall) when retailers clear inventory for new seasonal items. Holiday sales events like Memorial Day, Labor Day, and Black Friday also frequently feature discounts on previous-season colors.

For those seeking maximum value, the release of the Helium III has created opportunities to find the Helium II at clearance pricing as retailers make room for the newer model. While color and size selection may be limited, discounts can reach 30-40% off retail.

My Personal Experience: Four Seasons with the Helium II

After four years of regular use across diverse environments, my Helium II shows moderate wear but remains fully functional. The most visible signs of age appear along the shoulders where backpack straps have created slight abrasion patterns, and at the cuffs where daily use causes natural friction.

The DWR treatment has required refreshing approximately twice per year with proper washing and drying, plus occasional spray treatment. The original waterproof performance has diminished slightly but remains adequate for my typical uses.

The jacket has accompanied me on adventures across three continents, from desert canyon country to alpine environments above 13,000 feet. It’s been deployed in light drizzles, sudden thunderstorms, and as a wind barrier on exposed ridgelines. Throughout these varied conditions, it has maintained its core functionality while adding minimal weight to my pack.

Perhaps the highest praise I can offer is this: when preparing for trips where every ounce matters, the Helium II has never been cut from my packing list. Its combination of protection, weight, and packability earns it a permanent spot in my kit, despite its limitations. For me, that consistent inclusion speaks volumes about its practical value.

Final Verdict: Is the Helium II Right for You?

After thorough analysis, the decision comes down to your specific needs and priorities. The Outdoor Research Helium II represents an excellent choice if:

• Minimizing weight and pack space is a primary concern
• You need occasional rain protection rather than constant precipitation coverage
• Your activities involve intermittent rather than sustained high exertion
• Value is important alongside performance
• You prefer simplified, minimalist designs over feature-rich alternatives

You might want to consider alternatives if:

• Your adventures regularly involve extended periods in heavy precipitation
• You engage primarily in high-output activities requiring maximum breathability
• Hand pockets are essential for your comfort and convenience
• Maximum durability is needed for rough conditions and heavy pack use
• Budget is less important than absolute performance

Ultimately, the Outdoor Research Helium II delivers exactly what it promises: ultralight, packable weather protection that disappears in your pack until the moment you need it. Its limitations are predictable consequences of its design priorities rather than flaws, and for the right user, it represents one of the most useful pieces of outdoor gear available at its price point.

For lightweight backpackers, climbers, travelers, and outdoor enthusiasts who count ounces and value minimalist efficiency, the Helium II deserves serious consideration as your emergency weather protection layer. Despite newer competitors and even its own successor, it remains a benchmark against which other ultralight rain jackets are measured.