Outdoor Research Helium II Jacket

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The Outdoor Research Helium II Jacket is a an ultralight,…

Rating: rated 4 of 5 stars
Source: received it as a personal gift (Birthday gift from my "gear nut" wife)


The Outdoor Research Helium II Jacket is a an ultralight, breathable, and compressible rain/wind shell. The shell is made of 2.5-layer 30D Pertex Shield DS ripstop fabric (100% nylon) with clear laminate. While this jacket is very lightweight, it still has an impressive array of features! I use it as a three-season rain shell and as a wind shell when cold weather hiking. The most impressive thing about this jacket is that it only weighs 6.4 oz!


  • Nice fit
  • Very breathable
  • Very lightweight
  • Stuffs into its chest pocket
  • Stylish


  • Thin
  • No exterior hand pockets
  • No pit zippers
  • Expensive


Fit and Comfort:

I would say that the OR Helium II is true to size. I am 5'9" and 175 lb and a medium fits me just right. The arm and torso lengths are perfect for me. Some who are taller might would say that the torso should be longer. I can fit a baselayer underneath it, but definitely not anything bigger than a light fleece.

OR Helium II. This photo accurately displays the length of the jacket.


The hood and waist both have drawcords for adjustments. The hood's drawcord is in the rear. It would be nice if there were some adjustable cords in the front  as well, but it would add weight. The cuffs do have elastic in them, but are not adjustable.

Adjustable hood in the rear.

Cuffs have elastic on the bottom.


Water Resistance:

Considering the weight, this jacket is very waterproof. It can handle light to moderate rain. I would not personally choose it in a downpour, but I do not have expectations for this to be a Gore-Tex shell. It is also pretty wind resistant. Again, you do have to consider that it only weighs 6.4 oz and is very thin, so don't expect it to keep you warm and toasty in the 40's. The zippers are all also waterproof. 


This jacket is much more breathable than a regular shell. I hiked several times in the rain during the summer while wearing this. Obviously it did hold in some heat, but it did breathe substantially better than your average rain shell. I would say that it is about as breathable as a hard shell can get.


I have not exposed it to any very rough surface, but it has held up well to briars and tree limbs.


I am really impressed with all of the features that this minimalist shell has. It has a visor, adjustable hem and hood, chest pocket that doubles as a stuff sack, velcro interior pocket, waterproof zippers, and elastic cuffs. If it only had pit zippers and exterior hand pockets, it would be pretty much perfect.

Interior pocket with velcro closure

Visor hood

Stuffed into chest pocket



This is a great three season rain/wind shell. I never think twice about bringing it because it only weighs 6.4 oz. I wouldn't take it as my primary shell in the winter, but it is great to cut down wind while hiking in cold weather. I definitely recommend it if you are looking for an alternative to your 12oz+ shell.

Retailers' Descriptions

Here's what other sites are saying:

Built for flash-storm protection, the 100% waterproof, super-breathable Outdoor Research Helium II weighs just 6.4 ounces. An ultra-compressible piece you'll never leave behind, it's so light and packs down so small, you'll forget it's clipped to your harness until you throw it on to ward off a sudden mid-route downpour.

- CampSaver.com refers to the men's version

The Outdoor Research Helium II jacket offers complete storm protection for fast-moving outdoor athletes. It's so light you'll forget it's clipped to your harness until that sudden downpour.

- REI refers to the men's version

When a flash storm rolls up and the outside temperature drops 10 degrees in 10 minutes, don't call in a chopper; reach in your pack and grab ultralight Outdoor Research Helium II Jacket. Built with weather-resistant Pertex Shield fabric, the Helium II weighs in under seven ounces and packs down to practically nothing.

- Backcountry.com refers to the men's version

On Sale. Free Shipping. Outdoor Research Men's Helium II Jacket FEATURES of the Outdoor Research Men's Helium II Jacket Waterproof Breathable Lightweight Fully Seam Taped Water-Resistant Zippers Fully Adjustable Hood Single-Separating Front Zipper Internal Front-Zip Stormflap Zippered Napoleon Pocket Internal Pocket Doubles as Stuff Sack Carabiner Loop Elastic Cuffs Drawcord Hem SPECIFICATIONS of the Outdoor Research Men's Helium II Jacket Weight: (L): 6.4 oz / 180 g Standard Fit Center Back Length: 28 1/2in. / 72 cm Pertex Shield+ 2.5L, 100% nylon 30D ripstop This product can only be shipped within the United States. Please don't hate us.

- Moosejaw refers to the men's version

Lighter, more breathable, and more waterproof than the original, the Helium II from Outdoor Research packs down so small, you'll forget it's stuffed in your pack or clipped to your harness until you throw it on to ward off a sudden mid-route downpour.

- EMS refers to the men's version