A modern take on Helly Hansen’s iconic Lifa Stripe, the Lifa Merino Midweight stands out for its unique two-layer construction that pairs a moisture-wicking polypropylene lining with merino wool exterior. This combination balances warmth, breathability, and odor resistance, and it does so at a competitive $105 price point. To be sure, it’s not as soft next-to-skin as full-merino designs, and durability is solid but not on par with most synthetics. But for cold-weather adventurers who want to have their cake (warm and cozy merino) and eat it too (a base layer that performs well while sweating), it’s a winning combination.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
Fabric(s)
57% merino, 43% polypropylene
Fabric weight
Unavailable
Weight
9.7 oz.
Variations
Half zip, hoodie
Pros
Cons
Helly Hansen Lifa Merino
For this season's top models, see our guide to the Best Base Layers.
The Helly Hansen Lifa Merino Midweight provides slightly above-average warmth compared to its base layer competition. Its two-layer construction pairs merino wool on the outside with polypropylene on the inside, striking a balance between natural warmth (merino) and moisture management (polypro). For those hoping to stay both warm and dry (and who isn’t?), this is a winning combination.
While resort skiing, I layered the Helly Hansen Lifa Merino Midweight under a midweight down jacket and ski jacket (the Helly Hansen Sogn 2.0). The combination kept me warm and cozy on the mountain as temperatures dipped into the mid-20s. The Lifa Merino offers that dependable core heat you expect from a good base layer, although it would trap heat a bit more effectively if it fit a bit more snugly. Compared to my go-to Craft lightweight or midweight tops (which are 100% synthetic), the Lifa Merino felt noticeably heavier—closer to an expedition-weight Craft—thanks to its merino makeup. If you’re planning to ditch a midlayer, you might want to opt for a thicker base layer, although in almost all cases, I appreciate the versatility of a light-to-midweight base layer.
The Helly Hansen Lifa Merino Midweight base layer outperforms most standard merino tops in breathability, thanks to its inner layer of polypropylene. Compared to pure merino, polypropylene dries faster and sheds heat more effectively, making it a smart choice for high-output, cold-weather activities such as backcountry skiing, winter running, and cross-country skiing. That said, it lacks the advanced ventilation features found in technical options like the Smartwool Intraknit Thermal or Icebreaker 200 ZoneKnit—there’s no mesh, perforation, or mapped panels. While the Lifa Merino is not the most tech-heavy design, it’s still a step above traditional 100% merino pieces with no breathability upgrades.
Skate skiing is my ultimate test of breathability, and while I’ve yet to find a base layer that keeps me perfectly dry during high-output efforts, the Lifa Merino comes close. Its inner layer moves moisture and heat efficiently, but the warm outer merino tends to hold a bit of dampness. The result? I stayed relatively dry, but overheating is still inevitable when pushing hard. For that reason, I could see the Lifa Merino working well as a standalone piece for activities like fall mountain biking, where airflow helps offset the extra warmth.
The Helly Hansen Lifa Merino Midweight is solidly built, but its construction comes with trade-offs. Instead of weaving merino and synthetic fibers together, as most blended base layers do, Helly Hansen employs a two-layer design: merino on the outside and polypropylene against the skin. This approach delivers impressive warmth and breathability at a lower cost than most blends, but it sacrifices some durability. With no synthetic reinforcement in the outer fabric, the merino shell shares the same weaknesses as any 100% merino piece—less abrasion resistance and a tendency to thin over time.
That said, the polypropylene lining does give the Lifa Merino an edge over a pure merino option, such as the Ridge Merino Aspect. Still, a fully synthetic base layer like the Patagonia Capilene Thermal Weight will outlast both with virtually no special care. At $105, the Lifa Merino is a great value, but if I’m looking for a piece this warm, I might opt to spend a bit more and go with a full wool or blended design, which would feel cozier against the skin and better resist odor.
The Helly Hansen Lifa Merino Midweight offers a soft, comfortable feel overall, with a merino outer layer that has a natural, matte finish and good hand feel. Against the skin, the polypropylene lining is smooth but not as plush as high-end wool—it carries the expected synthetic feel, similar to Helly Hansen’s Lifa Stripe. For those choosing merino primarily for its next-to-skin softness, this construction may fall short since the wool is on the exterior rather than the inside.
The Lifa Merino has a moderate amount of stretch and a regular fit that moves well without restriction. I prefer a snugger, more technical fit for a base layer, but this design hits a nice middle ground for those who like a less compressive feel or plan to wear it as a standalone piece.
Odor resistance may not be the flashiest feature, but it matters—a lot. Synthetic-heavy base layers are notoriously prone to lingering smells, even after repeated washes. While some modern anti-odor treatments help, the most reliable way to keep stink at bay is with merino or merino-blend fabrics.
The Helly Hansen Lifa Merino performs above average in this category but doesn’t quite match full-merino or true blended options. The reason? Its polypropylene next-to-skin layer limits merino’s natural odor-fighting advantage. After several days of skiing, I subjected it to the sniff test—it didn’t smell fresh, but it was far from offensive. If ultimate odor resistance is a top priority, 100% merino designs like the Smartwool Classic Thermal and REI Co-op Merino 185 are hard to beat. For a balance of odor control, breathability, and moisture management, look to merino-first designs like the Smartwool Intraknit Thermal or Icebreaker 200 ZoneKnit.
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Longevity
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Responsible Wool
Responsible wool is most commonly certified by standards such as the Responsible Wool Standard (RWS) and ZQ Wool, which promote sustainable land management, animal welfare, and responsible farming practices, though some brands occasionally use other equivalent third-party certifications. A green check mark indicates a product uses responsibly sourced wool, a yellow check indicates the brand sources responsible wool for the majority of its products but does not specify it at the product level, and a red X indicates the product does not use responsibly sourced wool.
Recycled Materials
Recycled materials are prevalent in outdoor gear, with nylon, polyester, wool, and down among the most common, but the composition varies widely. A green check mark indicates the product is made with a substantial amount of recycled materials (100% recycled or the core fabric that makes up most of the product is recycled), a yellow check means it contains a moderate to small amount of recycled materials, while a red X means there are no recycled materials in the product.
Bluesign Approved
Bluesign Technologies, based in Switzerland, operates a third-party textile management system that ensures materials are manufactured to strict environmental, chemical, and worker safety standards. A green check mark indicates a product is either a Bluesign Product (contains at least 90% Bluesign-approved fabrics and 20-30% Bluesign-approved accessories) or features a significant amount of Bluesign-approved materials. A yellow check mark means it uses some Bluesign-approved materials but less than the aforementioned category, and a red X means there are no Bluesign-approved materials in the product.
Responsible Manufacturing
This criterion evaluates a brand’s commitment to fair wages, safe working conditions, and reducing environmental impact through certifications and programs like Fair Trade Certified, Fair Wear Foundation, Worldwide Responsible Accredited Production (WRAP), and the Fair Labor Association, while also recognizing brands that manufacture primarily in the U.S. or Europe under strict labor and environmental regulations. A green check mark indicates a brand meets our responsible manufacturing criteria, while a red X means it does not.
Recycled and/or Reduced Packaging
Packaging can add significant waste to outdoor gear purchases, so many brands work to reduce its impact by using recycled materials, incorporating Forest Stewardship Council-certified paper products, and minimizing plastic and paper use. A green check mark indicates a brand uses recycled or reduced materials across all of its packaging, a yellow check indicates moderate or limited use of recycled or reduced packaging, and a red X indicates the brand does not make either of these efforts.
Resale and/or Recycling Services
Resale and recycling programs help keep outdoor gear in circulation longer and out of landfills, ranging from trade-in resale platforms that offer store credit to take-back initiatives that recycle products at the end of their usable life. A green check mark indicates a brand offers both resale and recycling programs, a yellow check mark indicates it offers one or the two, and a red X indicates it offers neither.
Carbon Footprint Tracking
This criterion evaluates whether a brand measures, reports, and works to reduce its greenhouse gas emissions using established frameworks such as the Higg Index, Greenhouse Gas Protocol, or The Change Climate Project. A green check mark indicates a brand publicly reports greenhouse gas emissions data, sets clearly defined reduction targets, and uses established tracking frameworks such as Higg or The Change Climate Project. A yellow check mark indicates the brand tracks emissions and outlines reduction goals but provides limited data, lacks science-based verification, or does not clearly report progress. A red X indicates the brand does not appear to track greenhouse gas emissions or provides so little information that its efforts cannot be verified.
Annual Impact Report
Annual impact reports provide transparency and accountability by outlining a brand’s sustainability efforts across areas such as material sourcing, greenhouse gas emissions, waste, water use, supply chains, and packaging. A green check mark indicates a brand publishes a detailed, brand-specific impact report that closely aligns with our sustainability criteria and leaves little room for ambiguity. A yellow check indicates a brand provides some relevant sustainability reporting but lacks detail in key areas or is covered only briefly within a parent company report. A red X indicates a brand does not regularly publish an impact report.
Tester: 5’10” 145 lb.; 38" chest; 32" waist
Size tested: Men’s medium
I opted for a men’s medium in the Lifa Merino and it fit true to size. The base layer falls into what I’d call a regular fit—neither skin-tight nor overly loose. It has a more casual look than some of the highly technical base layers I’ve worn, which makes it versatile enough to wear on its own without looking like you just came from a run or a skate skiing session. While I personally prefer a closer fit for layering—it tends to trap heat better and slides more easily under midlayers—the Lifa Merino strikes a good balance for those who want comfort and standalone versatility.
Smartwool Intraknit Thermal Merino ($130): Better Performance, Different Fit
If you’re drawn to the performance characteristics of a merino-synthetic base layer, the Smartwool Intraknit Thermal is one of the most compelling options. Instead of layering one on top of the other à la the Lifa Merino, the Intraknit blends merino with polyester (and a little elastane) for improved durability, softer next-to-skin comfort, and superior odor resistance. It also offers a snug fit and strategic perforated vents for enhanced breathability, giving it the edge for high-output use. We love the Intraknit as a layering piece for serious sweat sessions in cold weather, but for $30 less, the Lifa Merino checks most of the same boxes in a more relaxed, versatile fit. For more, read our review of the Intraknit Thermal Merino.
Helly Hansen Lifa Stripe ($50): The Ol’ Standy
The Lifa Merino builds on the legacy of the Lifa Stripe, a 100% synthetic base layer that’s practically synonymous with the category. But at $55 less, what do you give up? Quite a bit. Without the merino exterior, the Lifa Stripe is far less cozy, noticeably less warm, and much more prone to odor over time. It’s about as no-frills as base layers come, but it still checks the fundamental boxes: wicking moisture and providing a basic layer of warmth. If price is the top priority, it’s hard to beat—but if you want something softer, warmer, and better smelling after multiple uses, there are more compelling options. For more, read our Lifa Stripe review.
The Lifa Merino features a two-piece construction that layers merino over top of polypro, resulting in an affordable cold-weather base layer for rigorous activity. However, the polypro isn’t cozy next to the skin and the merino outer is prone to wear.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
With a merino-polyester blend and mesh ventilation, Smartwool’s Intraknit Thermal is ideal for fast-paced activities in cold weather. It’s one of the only merino base layers we’ll wear when we plan to sweat. However, the price is high, and not everyone will love the skin-tight fit.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
The Lifa Stripe is an iconic layer from Helly Hansen for just $50. It’s all function here: The polypro material feels somewhat plasticky and isn’t particularly cozy, but it moves sweat away from the skin and dries quickly. Unfortunately, the fit isn’t refined, and there’s no odor-resistant technology.
Warmth
Breathability
Durability
Comfort
Odor Resistance
Sustainability
The Helly Hansen Lifa Merino Midweight is an excellent choice for cold-weather adventurers—skiers, hikers, snowshoers, and more—who want the combined benefits of merino wool and polypropylene in a relaxed, versatile fit. Its two-layer construction—polypropylene inside, merino outside—delivers strong moisture management for high-output activities while maintaining the warmth and odor resistance merino is known for. This approach also keeps the price lower than more technical blends like Smartwool’s Intraknit, and at $105, it’s a solid value among merino base layer options. Just note that comfort purists may prefer a design that places merino next to the skin, as the polypropylene lining feels more synthetic than plush.
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