Lighter than an apple.
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Most “ultralight” rain jackets lie. They say waterproof, but after 20 minutes in a real downpour, you’re wet — either from leaks or from your own sweat because the fabric doesn’t breathe.
The Outdoor Research Helium is the exception.
At 6.7 ounces (that’s less than a medium apple), it packs into its own pocket and disappears into a backpack, glovebox, or even a large purse. But unlike emergency ponchos or cheap packable shells, the Helium is a legitimate, fully seam-taped, 100% waterproof jacket.
The secret is Pertex Shield Diamond Faille — a 2.5-layer fabric that’s both waterproof (30,000mm hydrostatic head — that’s serious) and breathable (15,000g/m²/24h — enough for high-output activities like trail running or cycling).
What that means in real life: you can wear it for hours in steady rain without getting wet from outside or from your own sweat.
Outdoor Research Helium Rain Jacket for Women
What You’re Getting
| Feature | What It Means |
|---|---|
| 6.7 ounces (men’s), 6.2 ounces (women’s) | Light enough that you’ll actually carry it “just in case” |
| Packs into its own pocket | Folds down to the size of a burrito. Fits in a hydration vest pocket |
| Pertex Shield Diamond Faille fabric | 30,000mm waterproof rating, 15,000g breathability rating — real rain protection |
| Fully seam-taped | No leaks through stitching. Cheap jackets skip this |
| Mini stuff sack included (men’s version) | Keeps it compressed when not in use |
| Adjustable hood with wire brim | Stays put in wind. Wire brim keeps rain off your face |
| Zippered hand pockets | Two. Actually usable. |
| Durable Water Repellent (DWR) finish | Water beads up and rolls off. Refresh it with a wash-in treatment every year or two |
How It Compares
| Jacket | Weight | Waterproof Rating | Packs Into Itself? | Best For |
|---|---|---|---|---|
| Outdoor Research Helium | 6.7 oz | 30,000mm | Yes | Ultralight backpacking, trail running, everyday carry |
| Columbia Watertight II | 13 oz | 2,500mm | Folds into pocket | Budget commuting, light rain |
| BALEAF Cycling Jacket | 9 oz | 5,000mm | Yes | Cyclists, runners on a budget |
Who This Is For
- Hikers and backpackers who count every gram
- Trail runners who need a jacket that fits in a hydration vest
- Bike commuters who don’t want to arrive soaked
- Anyone who lives in a rainy city and is tired of bulky “emergency only” jackets
- Travelers who want one jacket that handles everything from Scotland to Seattle
The Helium is not a heavy-duty winter shell. It has no pit zips (a common complaint among hikers who run hot). And it’s not insulated — you’ll need layers underneath for cold weather.
But for what it’s designed to do (ultralight rain protection), it’s the best in its class.
FAQ
Q: Is the Helium actually waterproof, or is that marketing speak?
A: It’s actually waterproof. The 30,000mm hydrostatic head rating means you could put a 30-meter column of water on it before it leaked. For context, 10,000mm is considered “waterproof” for most outdoor gear. The Helium exceeds that by 3x.
Q: How is this different from a Frogg Toggs emergency poncho?
A: Frogg Toggs are cheap, fragile, and not breathable. The Helium is durable (with proper care), breathable enough for high-output activities, and actually fits like a real jacket. You can wear it on a trail run or a bike commute without feeling like you’re inside a trash bag.
Q: How small does it pack down?
A: Fits in the palm of your hand. The men’s version includes a mini stuff sack; the women’s version packs into its own pocket (no separate sack). Either way, it’s tiny.
Q: Can I wear this in winter?
A: As a shell over layers, yes. The Helium is not insulated. In cold rain or snow, wear a fleece or puffy underneath. The shell blocks wind and water; your layers provide warmth.
Q: Men’s vs Women’s — what’s the difference?
A: Fit, mainly. The women’s version has a slightly different cut (narrower shoulders, wider hips), shorter length, and comes in different colors. The technology and weight are virtually identical (women’s is actually a hair lighter at 6.2oz).
Shop This (The “Never Get Caught In The Rain” Kit)
- This Ultralight Merino Wool Pairs Perfectly Under The Helium — Wicks sweat, dries fast, adds warmth without bulk.
- This Rain Hat Wicks Sweat Away and is Weather Resistant — Works under the hood or alone.
- This DWR Wash-In Treatment Refreshes The Waterproofing Every Season — Nikwax Tech Wash + TX.Direct Wash-In. Two-step process, easy.
- This Stuff Sack Is Slightly Larger Than The Jacket’s Built-In Pocket — For when you need to pack other wet gear with it.
You Might Also Need (Interlinking)
- “These 6 No-Subscription Smart Rings Track Sleep Better Than An Apple Watch” — Track your recovery after a wet, cold hike. Your body needs rest, too.
- “This ‘Sauna Blanket’ Is The Viral Biohack People Are Using To Burn Calories While Watching Netflix“ — Post-hike recovery. The Helium keeps you dry outside. The blanket warms you up inside.
- “This Korean Exosome Shot Is Giving People ‘Filter-Like’ Skin In Under A Week“ — Rain + wind = irritated skin. Exosomes repair the damage.
- “8 ‘Salmon DNA’ Serums That Are Actually Erasing Years Of Sun Damage While You Sleep” — Cloudy days still have UV. Protect your skin under the jacket, repair it at night.
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