#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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#6 on this list
Microlight Alpine
Rab
The Rab Microlight Alpine is a proven mountain workhorse built for year-round utility. Combining a weather-resistant Pertex Quantum shell with 700-fill recycled down, this jacket delivers rugged dependability at a very reasonable price. It features zoned micro- and nano-baffles that prevent down migration, ensuring even warmth across the torso and arms even during high-movement activities like climbing or mountaineering. Out in the elements, the Microlight Alpine handles mist, snow flurries, and blustery winds better than most standard down jackets. The Nikwax-treated hydrophobic down repels moisture, retaining loft when exposed to damp air. The Pertex Quantum face fabric is sturdy enough to handle daily abuse, making it a reliable pick for everything from Scottish winter walking to chilly mornings at the local crag. Because it prioritizes durability and weather resistance, the Microlight Alpine is slightly heavier and less compressible than pure ultralight pieces. The wire-brimmed hood is fantastic in howling winds, but it adds a small amount of rigidity when packing down. For mountain users who want one durable, all-weather down jacket that won't require babying, it remains a standout. **Highlights** - Tough Pertex Quantum 30D ripstop nylon shell blocks wind and shed light moisture - 700-fill-power recycled down treated with Nikwax hydrophobic coating - Wire-stiffened peak on the hood maintains shape in heavy winds - Zoned baffle structure balances thermal efficiency with low bulk - Excellent durability-to-cost ratio for mountain use **Watch-outs** - Moderately heavy compared to ultralight backpacking jackets - Packs larger than jackets using 800+ fill-power down - Athletic cut can feel snug across the hips for some body types
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Specs side by side
| Spec | Mythic Ultra | Microlight Alpine |
|---|---|---|
| Insulation | 900-fill-power European goose down | 700-fill recycled down with Nikwax DWR |
| 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) | 467 g / 16.5 oz (Men's L) |
| Fill Weight | 240g / 8.5 oz | 153 g / 5.4 oz (Men's M) |
| Shell Fabric | — | 30D recycled Pertex Quantum ripstop nylon |
| Baffle Design | — | Zoned micro- and nano-baffle stitch-through |
| Fit Profile | — | Slim athletic cut |
What our reviewers liked and didn't
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
Microlight Alpine
- Durable 30D Pertex Quantum shell resists snags and cuts high winds effectively.
- Hydrophobic 700-fill down preserves loft and warmth in damp maritime air.
- Wire-stiffened hood brim holds its shape against driving mountain squalls.
- Harness-compatible pockets and athletic articulation suit technical climbing.
- Heavier and packs down larger than premium 800-fill-power alternatives.
- Stitch-through micro-baffles create small cold spots in heavy freezing winds.
- Athletic cut runs noticeably slim through the hips and lower abdomen.
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