Last year Hyperlite Mountain Gear (HMG) released their first entry into the high end ultra-light outerwear market with the intrepidly named brow-raising jacket, “The Shell“. Already well known for their ultralight backpacks and shelters made from expensive but high performance fabrics this level of design in a piece of clothing was sure to turn heads and I was quite excited to find out I would receive a demo model to review.

How I Tested

I started testing in February while in the middle of my winter guiding season. This allowed me about 25 days of back-country skiing, mountaineering, and waterfall ice climbing to get acquainted. I only parted with my test model for a week to allow a fellow guide a chance to bring it on a South America climbing trip and was happy to get it back in time for a week long trip back-country skiing in Iceland. All in all this demo model saw 35+ days of combined multi-sport use from New Hampshire’s rugged White Mountains, to 17,000 feet on Ishinca in the Andes, to the Trollaski Penisula in northern Iceland. The results are in!

Durability

Generally I like to start a gear review focused on the single most positive aspect of the item I’m reviewing and work down from there. With the HMG “The Shell” there was a four-way tie between Durability, Weight, and Pack-ability, and Performance. But durability ultimately wins out as this is the one feature I feel justifies the sticker shock when one first sees the price. This jacket is made from DCF-WPB fabric with Dyneema.

Dyneema is stronger than steel for its weight and has excellent fatigue resistance (cyclic bending) and UV, chemical and abrasion resistance. This durability is brazenly referred to from HMG as “tough as f*#k”. Although the jacket has only been out for less than a year I’d say it is safe to assume this material and construction will last 3-4 times longer than pieces that try to achieve what this jacket achieves with so little weight. A more conservative statement would be “This jacket will easily have triple the lifespan of non-Dyneema jackets.” So if this jacket can easily outlast models that cost half as much while offering the benefits I will get into below that sticker shock might start to subside.

Weight

If you get a chance to take one of these off the rack at a gear show you are going to be surprised at the weight, or lack of. You’ll need to look twice to make sure you really are holding it. A technical specification of 5.8 ounces does not do it justice, you need to hold this in your hand to get a sense of what “feather weight” really feels like. The only other shell I have tested that can come close to this ultra-light feel is the Black Diamond Alpine Start Hooded Jacket (2 ounces heavier). An amazing jacket at a more affordable price, but not 100% water-proof or nearly as indestructible as The Shell.

Pack-Ability

The Shell has one small zippered pocket on the front right that can be turned inside out and used as a storage sack complete with a small sewn carabiner loop for attaching to the back of your harness. The stuffed size is about the size of a softball with about a 4 inch diameter. This pack-ability will let you stuff this into the smallest of CamelBaks, running packs, and waist packs for go anywhere mobility.

Performance

There’s manufacturer claims and real life performance. Let’s look at each.

Claim: Waterproof Ratting: 10,000mm– This means the jacket should handle moderate to heavy rain.

Real-life: Unfortunate for our snow-pack but fortunate for my testing this past winter was plagued by multiple mid-winter rain events that allowed some serious testing of the waterproof claim from HMG. I wore this on at least three rainy adventures and my experience was that this jacket truly is waterproof. At first I was concerned about the front zipper as it did not look like the polyurethane waterproof thin zippers I was expecting (the small pocket on the jacket uses that style). Turns out HMG went with a longer lasting VISLON^® Aquaguard^® Zipper for the main zipper and I found it to be impenetrable even in the 40-50 mph raining-sideways-summit-day I had on Mount Washington. The slight stiffener in the visor on the hood was just enough to help keep the heaviest of downpours of the face.

Claim: Breathability Rating: 32,000 gm²/24hr– This is an incredibly high rating of breathablity for a fabric that also can claim true waterproofness!

Real-life: I’ll be honest and state that I was concerned about the breathability of a waterproof jacket with no pit zips or side ventilation. My concerns were first alleviated during an avalanche course I was teaching when I skinned from the trail-head to Hermit Lake, (2.3 miles, 1,870 elevation) in 1 hour 20 minutes on a 28°F (-2°C) day. It was one of the few times I’d ever left a shell jacket on while skinning in such fair weather all the way to Hermit Lake. Having easily logged another 20,000 feet of uphill travel in the back-country while wearing The Shell I can whole-heartedly attest to an accurate breathability rating! The only other pieces I could compare this level of breathability to is the Black Diamond Alpine Start Hooded Jacket or the Patagonia Houdini (not as indestructible as The Shell, or considered waterproof).

Sizing/Fit

The only media sample I could get was a size medium so the fit was a touch snug for my 180 lb 5’9″ build with a 42 inch chest. HMG’s sizing chart would put me into a size large which I think probably would have been perfect. It is important to recognize that Dyneema fabrics have almost no stretch to them which means clothing must be quite quite close to your body’s own specifications or quickly be to tight or to baggy. That said I was able to wear this as a “second skin” right over my Ortovox Merino wool T-shirts. In cold conditions I’d layer my mid-weight puffy jacket’s, my full belay jackets, or my heavy ski jackets over it. If I wanted to wear more insulation under it I would have to get into my appropriate size, which would have been a large. Bottom line is following the sizing info on the HMG website and it should fit you well!

Other Media

You can read the manufacturer specifications and right of HMG’s website here so I’m not going to cut & paste them here (unless you find that more convenient)? I am going to share the quick promotional video they produced as I think it shows the hood fit and other features quite well:

Summary

“The Shell”. Such a simple and confident name for a garment. It makes me think of the LOTR “one ring to rule them all” line for some reason. Is this the one shell you’ll ever need? Probably not. It is a niche type item. It is the epitome of minimalist functional artisan design. I love how it performed. I love the weight and pack-ability of it. I love that it is made in Maine!

Who is this for? This is an obvious winner for the ultra-light crowd, whether you’re a climber, skier, long distance trail runner, or sea kayak-er I can see this becoming a new favorite. The simple expected lifespan of this piece (Dyneema does not degrade naturally as fast as nylon) means this could be one of the best value pieces out there for its intended purpose. Hyperlite Mountain Gear has entered the outerwear business with The Shell, and I’m really glad they did!

See you in the mountains,

Northeast Alpine Start

Disclaimer: Hyperlite Mountain Gear provided me with this media sample. This post contains affiliate links. If you make a purchase after clicking on the these links, a portion of the sale helps support this site at no additional cost to you.