#9 on this list
Aequilibrium Lite GTX
La Sportiva
The La Sportiva Aequilibrium Lite GTX strips away virtually every non-essential feature to deliver an ultralight emergency storm shell for fast-and-light mountain travel. Tailored specifically for fastpackers, skyrunners, and minimalist alpinists, this jacket weighs an astonishing 6.8 ounces for men and 6.4 ounces for women. Testers have praised it as one of the most packable true Gore-Tex hardshells on the market, shrinking down to the size of an apple. Despite its minimal mass, La Sportiva incorporated Gore-Tex's next-generation ePE Performance membrane. This provides genuine waterproof-breathable storm protection that far exceeds the durability of standard PU-coated emergency rain shells. The jacket features elasticated cuffs, a snug, low-profile hood designed to fit under or over slim climbing helmets, and streamlined seam taping that cuts pack weight down to the absolute bare minimum. The severe weight reduction comes with unavoidable operational compromises. There are no underarm pit zips, pocket storage is reduced to a single chest pocket, and the ultralight face fabric will tear if dragged across sharp rock or forced through dense brush. At roughly $309, it is an exceptional specialized tool for moving fast in the high country, but it cannot substitute for a general-purpose, four-season mountaineering jacket. **Highlights** - Incredibly light at just 6.8 oz (men's) / 6.4 oz (women's) - Next-generation Gore-Tex ePE Performance waterproof-breathable membrane - Packs down tiny, fitting easily into running vests or summit packs - Clean, streamlined tailoring reduces wind drag on ridges - Accessible price point of approximately $309 for Gore-Tex tech **Watch-outs** - Ultra-thin face fabric has very low resistance to sharp rock abrasion - No pit zips and only a single pocket limit utility for winter alpine use
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#10 on this list
Mythogen Jacket
Mountain Hardwear
The Mountain Hardwear Mythogen Jacket is purpose-built for big-mountain winter utility, focusing squarely on the demands of backcountry skiers, snowboarders, and foul-weather winter mountaineers. While minimalist shells prioritize shedding grams, the Mythogen embraces a robust, protective build that shields the wearer against freezing winds, blowing powder, and heavy winter precipitation. Independent reviews highlight its feature-dense design as one of the best winter-specific hardshell platforms available. Weighing in at 1 pound 6 ounces, the jacket has substantial substance, translating into rock-solid wind-blocking power and elevated resistance to wear from ski edges, trees, and pack hipbelts. Mountain Hardwear equipped the Mythogen with winter-centric details, including massive front pockets that easily accept climbing skins, a fully articulated helmet-compatible hood that locks out drafts, and deep two-way underarm pit zips that allow for aggressive venting while breaking trail on steep skin tracks. The jacket's dedicated winter focus makes it less practical for non-snow seasons. Its weight and packed volume make it far too heavy for summer alpine scrambles or backpacking, and the roomier, relaxed fit—tailored to accommodate thick fleece and down midlayers—can feel overly baggy when worn over just a light base layer in shoulder seasons. **Highlights** - Burly winter-ready construction built for heavy snow and high winds - Oversized front pockets designed to swallow climbing skins - Long two-way pit zips allow thorough thermal dumping on ascents - Spacious helmet-compatible hood with multi-way storm adjustments - Generous cut engineered for layering over technical winter insulation **Watch-outs** - Heavy at 1 lb 6 oz, making it unsuited for summer backpacking - Relaxed, bulky cut feels oversized when worn without thick midlayers
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Specs side by side
| Spec | Aequilibrium Lite GTX | Mythogen Jacket |
|---|---|---|
| Weight | 6.8 oz (men's) / 6.4 oz (women's) | 1 lb. 6 oz. (approx. 624 g) |
| Waterproof Membrane | Gore-Tex ePE Performance | — |
| MSRP | Around $309 | — |
| Pockets | Single zippered chest pocket | — |
| Ventilation | None (no pit zips) | Two-way underarm pit zips |
| Pack Size | Compresses to roughly apple size | — |
| Primary Focus | — | Backcountry skiing and winter mountaineering |
| Pocket Design | — | Oversized, skin-compatible front pockets |
| Hood Integration | — | Fully adjustable, helmet-compatible storm hood |
| Fit Profile | — | Relaxed winter cut for layering |
What our reviewers liked and didn't
Aequilibrium Lite GTX
- Weighs only 6.8 ounces while offering genuine Gore-Tex storm defense
- Compresses down to the size of an apple for effortless packing
- Advanced ePE membrane offers waterproof-breathable performance without PFAS
- Streamlined, close-fitting cut eliminates excess fabric flap in high winds
- Ultra-thin face fabric is vulnerable to abrasion on rock and brush
- Lacks underarm pit zips for mechanical venting on steep climbs
- Minimalist layout provides only a single chest pocket for gear storage
Mythogen Jacket
- Substantial weather protection against high winds and driving snow
- Generous pocket layout easily accommodates backcountry climbing skins
- Deep two-way pit zips deliver effective mechanical ventilation on ascents
- Relaxed cut easily layers over thick winter insulation pieces
- Heavy 1 lb 6 oz weight makes it impractical for summer backpacking
- Roomy fit feels overly baggy when worn with minimal base layers
- Substantial bulk takes up notable volume inside a technical pack
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.