In-depth review
Outdoor Research Helium Rain Jacket Review (2027)
In-depth review of the Outdoor Research Helium: 6.2 oz Pertex Shield build, storm worthiness, and ultralight trade-offs.
Outdoor Research Helium Rain Jacket
A 6.2 oz Pertex Shield shell that disappears into any pack.
Our verdict
The Helium makes a single promise and keeps it: real, seam-taped storm protection at 6.2 oz, so it is in your pack on every trip instead of hanging in the closet. Pertex Diamond Fuse fabric is tougher than its weight class suggests. What you give up is pit zips and expedition durability, and for the thru-hikers and climbers it is designed for, that trade is exactly right.
What we like
- 6.2 oz is among the lightest fully featured shells
- Pertex Shield Diamond Fuse fabric is tougher than its weight suggests
- Packs into its own chest pocket with a clip loop
- Adjustable hood and elastic cuffs keep the design trail-serious
What to watch out for
- No pit zips; breathability is membrane-only
- Minimalist fit limits thick layering
- Light fabric demands care around straps and rock
What owners report: Outdoor Research Helium Rain Jacket
Synthesized from recurring themes in long-term owner feedback.
Most praised
- It vanishes into a pack so completely that owners carry it on days they would have gambled without a shell
- The Pertex fabric feels tougher in hand than other shells at this feather weight suggest
- A proper adjustable hood and a pocket that becomes its own stuff sack keep it trail-serious, not a bin liner
Common complaints
- With no pit zips, fast climbing means choosing between overheating and opening the front in the rain
- The trim minimalist cut has little room for a thick insulated layer underneath
- Owners treat the light face fabric carefully around pack straps and sharp rock
Who it is for
Thru-hikers, climbers, and ultralight backpackers in ranges where rain is episodic rather than constant.
Weight and packability
At 6.2 oz for a men's medium, the Helium weighs less than the water bottle it packs beside, and it stuffs into its own chest pocket to the size of a sandwich. This is the entire argument for the jacket: rain gear only works if you carry it, and no one leaves 6 oz behind to save weight. The carabiner loop on the stuff pocket is a small, telling touch for climbers.
Storm performance, honestly
Pertex Shield is rated at 30,000 mm waterproofness, and the fully taped seams keep real storms out on trail. The honest limits are duration and abrasion: in multi-day deluges, ultralight shells wet out sooner than 3-layer jackets, and the light face fabric needs respect around granite and heavy pack straps. For Sierra afternoons and Appalachian squalls, it is entirely sufficient.
Breathability without pit zips
There are no pit zips, so heat management is the membrane's job plus the front zip. On steep climbs in warm rain you will sweat; every ultralight shell without venting does this, and the Helium's Pertex fabric breathes respectably for its class. Hikers whose routes mean hours of climbing in rain should step up to a shell with pit zips or a 3-layer build.
Key specifications
- Weight (men's M)
- 6.2 oz (176 g)
- Construction
- 2.5-layer Pertex Shield Diamond Fuse
- Waterproof rating
- 30,000 mm (Pertex Shield)
- Venting
- None (no pit zips)
- Features
- Chest pocket stuff sack, carabiner loop
Also consider
Rab Downpour Plus 2.0
A fully featured Pertex Shield 2.5-layer shell for hiking and climbing.
Why consider it: A tougher Pertex Shield build with full features, if you accept roughly double the weight.
- Weight: 13.2 oz (375 g)
- Construction: Pertex Shield 2.5-layer
Black Diamond Fineline Stretch Rain Jacket
A stretch 2.5-layer BD.dry shell with real pit zips at 11.3 oz.
Why consider it: Stretch fabric, 13 in pit zips, and pocket packability for rain-heavy routes.
- Weight (men's M): 11.3 oz (320 g)
- Construction: 2.5-layer BD.dry laminate, fully seam-taped
Research-based assessment. TrueGear has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.
Questions, answered
Is the Helium durable enough for a thru-hike?
Many have finished thru-hikes. Treat the fabric with ordinary care, avoid sitting on abrasive rock in it, and the Diamond Fuse weave will outlast expectations for its weight.
Does it have hand pockets?
The design prioritizes weight: a single chest pocket that doubles as the stuff sack. Hip belt users should note hand-warmer pockets are not the point of this jacket.
Can it serve as a wind jacket too?
Yes. At this weight it doubles as your wind layer on summits and ridges, which is how many owners justify carrying it on dry forecasts.