Active Gear Review is supported by its audience. If you purchase through links on our site, we may earn an affiliate commission.
Inselberg, a New Zealand-based mountaineering brand, is one many of you likely haven’t heard of (I know I was firmly in that camp). Founded by Jarlath Anderson, who grew up climbing in New Zealand’s rugged backcountry, Anderson has a background in international apparel and spent three years developing Inselberg’s debut line of gear, focusing on durability and technical performance. The Infima Jacket, clearly inspired by the Arc’teryx Atom jacket and priced at $220, exemplifies this commitment, offering a lightweight and adaptable design suitable for both alpine adventures and everyday use.
Inselberg Infima Jacket Fit and Style: 3.5/5
As mentioned above, the Inselberg Infima jacket clearly takes inspiration from premium pieces like the Arc’teryx Atom LT or Mammut Rime Light IN Flex. It offers a trim, athletic silhouette that looks solid both in the city and on the trail.
While the fit leans slightly slimmer than the Atom LT (which I also own and have worn extensively), it still maintains a flattering profile. Those between sizes or into lasagna-style layering for colder conditions may want to size up. The slimness of the cut is most notable in the arms, particularly when wearing a slightly heavier layer underneath. If you’re blessed with Dwayne Johnson-esque guns, you may want to look elsewhere.
One odd little annoyance I can’t get away from is the wrist cuffs. Very similar in design and look to the Arc’teryx Atom, the cuff on the right sleeve performs as expected. However, the left cuff tends to bunch and cause the sleeve to ride up. I’m assuming there’s a slight deviation in stitching on the left sleeve that causes this, but it’s worth noting.
Cuff Issue
The Infima only comes in two colors, Abyss (black) and Astra (light gray, seen here), so unless you’re into a more subtle aesthetic, you might be left wanting.
Inselberg Infima Jacket Minimal Branding
Lastly, if you’re someone who likes to wave the flag of brands that no one has ever heard of, the Inselberg will surely deliver — unless you’re recreating Frodo’s journey in The Lord of the Rings (shot in New Zealand, and clearly demonstrating my geekiness).
Inselberg Infima Jacket Functionality: 4/5
In terms of performance, the Infima delivers solid warmth-to-weight for both urban and backcountry use. It’s breathable enough for active pursuits and insulates well in cooler (albeit not frigid) conditions. However, some small compromises are noticeable: the zippers aren’t quite as smooth or confidence-inspiring as higher-end models, and the cuffs can feel a little fussy, as mentioned above. These quirks don’t ruin the experience but are a reminder of where this jacket differs from the pricier $300 Arc’teryx Atom jacket. Still, it gets the job done, and done well enough for most outdoor users.
Inselberg Infima Jacket Side Pocket Access
The material, while not quite on par with Arc’teryx in refinement, holds its own with a clean aesthetic and durable feel. It’s not haute couture mountain wear, but it definitely looks the part. Sleek and clean design is definitely on order here. The exterior surface material is LETO 20, a 60% biobased nylon and 40% regular nylon blend that is both lightweight and (at least up to this point) durable. Keep in mind, however, that this jacket leans into being lightweight over heavy-duty durability, and this material reflects that.
Exterior Material
Standard Polartec Power Grid and Primaloft Gold Active+ round out the stretch side panels and insulation, respectively, so you know you’re in good hands. The insulation is light, so this isn’t the layer you’re going to reach for on your next Everest expedition, but it does really well in less severe conditions.
Cinch Cord and Stretch Panel
Value: 4.5/5
This is where the Inselberg Infima shines. Compared to the Arc’teryx Atom LT, it offers a lot of similar utility at a significantly lower price point. While you give up a bit of refinement and polish, you gain a jacket that performs admirably at a solid discount — and that pocketed $60 can go toward lift tickets, climbing gear, or a round at the bar for you and your buds après. For budget-conscious adventurers or those looking to round out their gear collection without breaking the bank, the Infima is a solid alternative.
Final Thoughts on the Inselberg Infima Jacket: 4/5
The Inselberg Infima Jacket is a budget-friendly, high-performance alternative to the Arc’teryx Atom LT. With solid warmth, a trim fit, sleek style, and lightweight build, it’s a great choice for outdoor enthusiasts looking for reasonable quality without the premium price tag. Ideal for hiking, travel, or everyday wear, the Infima offers excellent value at $220. If you’re seeking a lightweight insulated jacket that balances performance and price, the Inselberg Infima is well worth a look — knowing there are a few minor trade-offs compared to some of its more expensive counterparts. Available in 2 color ways and 6 sizes (XS – XXL). The Inselberg Infima retails for $220 See it at: inselberg.com