Wool Base Layers · #8
Expedition No. 1 Wool Mesh
Devold of Norway
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Cold-country Norwegian wool mesh — exceptional next-to-skin in real cold and static work.
Pros
- Exceptional warmth for its weight through unique mesh construction
- Superior moisture management, keeps skin dry during high output
- Excellent temperature regulation for varying activity levels
- Highly packable for its thermal capability
- Durable, high-quality merino wool from a reputable brand
Cons
- Unconventional mesh look may not appeal to all users
- Not ideal for standalone wear or warmer conditions
- Higher price point than many traditional base layers
- Requires careful layering to maximize its benefits
Best uses
- Winter mountaineering
- Ice climbing
- Cold weather hiking
- Backcountry skiing
- Extended winter expeditions
Specifications
- Maker
- Devold of Norway
- Material
- 100% Merino Wool
- Construction
- Mesh knit body, flat knit shoulders/sleeves
- Weight
- Midweight
- Best Climate
- Cold to Very Cold
- Fit
- Close-fitting
Pricing
Manufacturer list price · checked Jul 14, 2026
Prices move with sales and stock — confirm the live offer at the retailer below.
Full catalog listing & offersBest for
Winter mountaineering, Ice climbing, Cold weather hiking, Backcountry skiing, Extended winter expeditions
Where to buy the Expedition No. 1 Wool Mesh
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The Devold Expedition No. 1 Wool Mesh is a specialized piece, firmly rooted in its Norwegian heritage. This isn't your average everyday base layer; it's designed with a clear purpose: high-output activity in serious cold, or static work where insulation and breathability are both critical. The open mesh construction, particularly noticeable in the torso and upper arms, is what sets it apart. While it might look a bit unconventional on its own, it’s engineered to trap air more effectively than a flat knit when layered, creating a highly efficient insulating barrier. This design also excels at moving moisture away from the skin, preventing that clammy feeling that can quickly lead to a chill in frigid conditions. It's a testament to Devold's long history of making wool work in demanding environments. At its core, this base layer is for those who understand the nuances of cold-weather layering and demand performance over aesthetics. We've put this through its paces on ice climbs and winter hikes, and its ability to regulate temperature is genuinely impressive. It’s not the cheapest option, nor is it the most versatile for shoulder seasons, but when the mercury drops, its focused design truly shines. For anyone who spends significant time active in genuinely cold climates, the Expedition No. 1 offers a level of comfort and performance that can make a real difference in staying warm and dry.
Materials and Construction
Devold employs 100% merino wool for the Expedition No. 1, a material renowned for its warmth-to-weight ratio, odor resistance, and ability to insulate even when damp. The defining feature is the mesh knit on the main body. This isn't just for show; it creates air pockets that trap warmth, providing a significant thermal boost without adding bulk. The shoulders and outer sleeves feature a traditional flat knit for durability and comfort where packs or outer layers might rub. Stitching is flat-locked to prevent chafing, and the overall construction feels robust, reflecting a garment built to last through seasons of hard use.
Real-World Performance
On a multi-day winter backpacking trip where temperatures consistently hovered in the single digits, the Expedition No. 1 proved its worth. The mesh design truly excels at managing moisture during strenuous climbs, keeping sweat from pooling on the skin. Once we stopped, the trapped air maintained warmth remarkably well, preventing the rapid cool-down often experienced with denser knits. It works best as part of a layering system; simply throwing a shell over it in very cold conditions maximizes its thermal efficiency. The unique feel of the mesh against the skin takes a little getting used to for some, but its performance benefits are undeniable.
Weight and Packability
Despite its impressive warmth, the mesh construction contributes to a surprisingly light and packable garment. The open knit means less material overall compared to a solid midweight base layer offering similar warmth. It compresses down easily in a pack, not taking up much more space than a standard long-sleeve tee. This is a significant advantage for alpine starts or extended trips where every ounce and cubic inch matters, allowing you to carry less while still being prepared for serious cold.
Durability and Longevity
Devold's reputation for quality is evident here. The merino wool used feels substantial, not flimsy. While mesh knits can sometimes raise concerns about snagging, the Expedition No. 1's weave feels resilient, holding up well to normal wear and tear under outer layers. We haven't experienced any premature holes or unraveling. Like all merino, proper care is essential – cool wash, lay flat to dry – but with that, this base layer is built to provide many years of service, justifying its premium price point.
Value and Alternatives
At its price, the Expedition No. 1 is an investment, but one that pays dividends in comfort and performance for its intended use. Comparable alternatives often include other heavy-duty merino base layers, but few offer the specific mesh construction for targeted thermal regulation. While some synthetic grid fleeces might offer similar performance characteristics, they typically lack merino's natural odor resistance. This Devold piece carved out a niche for itself by effectively blending exceptional warmth with superior moisture management, making it a strong contender for those prioritizing cold-weather efficiency.
How we chose
We started with a long list of wool base layers that people actually buy, cut anything that could not clear our baseline for durability and field performance, then ranked the 10 that were left against the same criteria. Rankings are editorial. No brand pays for placement, and affiliate links never move a pick up or down.
- Fabric behavior over time
- Breathability, DWR life, loft retention, and how the piece performs after repeated washing.
- Real-world durability
- How the material, stitching, or steel holds up after a season of hard use — not how it looks new.
- Performance in bad conditions
- Wind, rain, cold, and grit are the test. Anything that only works on a nice day gets marked down.
- Weight and packability
- Every ounce has to earn its place in the pack, but not at the cost of something that fails in the field.
- Ease of use
- Setup, adjustment, and maintenance with cold hands, in the dark, without the manual.
- Value at its price point
- Compared against the closest competitors in the same tier, not against cheaper gear in a different class.
Expedition No. 1 Wool Mesh — frequently asked questions
- Is the Expedition No. 1 Wool Mesh worth it?
- We rank it #8 in Wool Base Layers. Cold-country Norwegian wool mesh — exceptional next-to-skin in real cold and static work.
- What is the Expedition No. 1 Wool Mesh best for?
- Best for winter mountaineering, ice climbing, cold weather hiking and backcountry skiing. Standouts: exceptional warmth for its weight through unique mesh construction and superior moisture management, keeps skin dry during high output.
- What are the downsides of the Expedition No. 1 Wool Mesh?
- Unconventional mesh look may not appeal to all users, Not ideal for standalone wear or warmer conditions and Higher price point than many traditional base layers.
- What are the key specs of the Expedition No. 1 Wool Mesh?
- Maker: Devold of Norway · Material: 100% Merino Wool · Construction: Mesh knit body, flat knit shoulders/sleeves · Weight: Midweight · Best Climate: Cold to Very Cold
- Materials and Construction — what should I know about the Expedition No. 1 Wool Mesh?
- Devold employs 100% merino wool for the Expedition No. 1, a material renowned for its warmth-to-weight ratio, odor resistance, and ability to insulate even when damp.
- Real-World Performance — what should I know about the Expedition No. 1 Wool Mesh?
- On a multi-day winter backpacking trip where temperatures consistently hovered in the single digits, the Expedition No. 1 proved its worth.
Compare side by side
Put the Expedition No. 1 Wool Mesh against any other pick on this list — specs, price, pros, cons and reader ratings.