#4 on this list
Stretchdown Hooded Jacket
Mountain Hardwear
The Mountain Hardwear Stretchdown Hooded Jacket abandons standard stiff, noisy nylon in favor of a unique stretch-woven face fabric that moves naturally with your body. Traditional down jackets restrict shoulder mobility during climbing, scrambling, or camp chores, but the Stretchdown flexes easily without binding across the back. It also eliminates needle-stitched seams entirely, using woven baffles to hold the 700-fill down in place and stop drafts. In cold, rough environments, this jacket feels far more like a durable softshell than a delicate puffy. The matte fabric is quiet, resists abrasions from coarse granite, and withstands brush encounters that would rip typical ultralight shells to shreds. The warmth is substantial and steady, making it an exceptional cold-weather cragging jacket, belay puffy, or rugged camp layer. The downside to all that comfort and durability is weight and bulk. The dense stretch fabric makes the Stretchdown one of the heavier jackets in this lineup, and it does not compress nearly as small as thin-shelled alternatives. It is an active insulator for rugged terrain, not an ultralight piece for minimalist backpackers. **Highlights** - Durable stretch-woven fabric delivers unrestricted mobility - Discontinuous bonded baffles eliminate cold spots and needle holes - 700-fill RDS-certified down provides reliable warmth - Soft, quiet face fabric eliminates the crinkly nylon noise - Multiple exterior and interior pockets for ample gear storage **Watch-outs** - Considerably heavier and bulkier than standard backcountry puffies - Slower to dry if the thick shell fabric becomes saturated - Baffle weave can occasionally pull small down plumes through if snagged
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#5 on this list
Mythic Ultra
Rab
The Rab Mythic Ultra is an engineering marvel designed specifically for fast-and-light mountaineers, alpine climbers, and winter thru-hikers who demand maximum warmth for minimum weight. What sets it apart is Rab's TILT (Thermo Ionic Lining Technology), a heat-reflective scrim applied to the inner lining that bounces radiant body heat back to the user without adding bulk or sacrificing breathability. Paired with 900-fill hydrophobic down, it delivers staggering thermal performance. In the field, the Mythic Ultra feels almost weightless yet provides warmth comparable to jackets twice its mass. The body-mapped baffle construction uses box-wall baffles on the core to prevent cold spots, transitioning to stitch-through baffles on the arms for better mobility. A helmet-compatible hood with internal elastic cinches snugly around a climbing helmet or bare head, keeping biting summit winds out. Unsurprisingly, such extreme performance requires delicate care. The 10-denier Pertex Quantum outer fabric is paper-thin and easily damaged by crampons, sharp rock edges, or bushwhacking. This is a dedicated technical piece meant to be packed away until you hit freezing belays, exposed ridges, or sub-zero camp bivies. **Highlights** - TILT inner lining reflects body heat without adding weight - Sky-high 900-fill-power European goose down with Nikwax hydrophobic finish - Hybrid box-wall and stitch-through baffle construction maximizes efficiency - Helmet-compatible down-filled hood with stiffened peak - Phenomenal warmth-to-weight ratio for cold-weather alpine missions **Watch-outs** - High investment cost tailored strictly for alpine specialists - Fragile 10D shell requires deliberate care around abrasive gear - Technical fit and shiny aesthetic are less suited for casual, around-town wear
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Specs side by side
| Spec | Stretchdown Hooded Jacket | Mythic Ultra |
|---|---|---|
| Insulation | 700-fill RDS-certified down | 900-fill-power European goose down |
| Shell Material | 20D stretch-woven nylon elastane blend | — |
| Average Weight | 17.7 oz / 501 g | — |
| Baffle Design | Discontinuous woven-channel construction | — |
| Hood | Snug, elastic-bound under-helmet profile | — |
| Pockets | Two hand, one chest, two internal drop-ins | — |
| Down Treatment | — | Nikwax fluorocarbon-free hydrophobic finish |
| Outer Shell | — | 10D Pertex Quantum ripstop nylon |
| Lining Tech | — | TILT heat-reflective scrim |
| Total Weight | — | 537g / 18.9 oz (Men's Medium) |
| Fill Weight | — | 240g / 8.5 oz |
What our reviewers liked and didn't
Stretchdown Hooded Jacket
- Exceptional shoulder and arm mobility via durable stretch-woven fabric
- Continuous woven baffles eliminate needle perforations and cold drafts
- Substantially more tear and abrasion resistant than standard nylon puffies
- Matte finish is quiet and avoids the noisy crinkle of ultralight shells
- Noticeably heavier and bulkier than standard 800-fill backcountry layers
- Thick face fabric takes longer to dry if fully saturated by moisture
Mythic Ultra
- Unmatched warmth-to-weight ratio powered by 900FP down and TILT lining
- Box-wall core baffles eliminate cold spots in high-wind alpine environments
- Excellent helmet-compatible hood articulates without obscuring peripheral vision
- Packs down remarkably small for a jacket with this tier of thermal output
- Wispy 10-denier shell requires meticulous care around sharp technical hardware
- High price tag limits practical appeal to dedicated cold-weather specialists
- Shiny technical aesthetic and tailored alpine cut look out of place around town
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