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Black Diamond Solution 150 Base Layer Review

Jack Yagua (gear tester)
ByJack Yaguda
Feb 21, 2025
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Our Take:
4.5/5
The Solution 150 ($135) is a versatile merino blend base layer that balances warmth, durability, and comfort. Thanks to its NuYarn construction, it’s more robust than 100% merino, holding its shape better while maintaining merino’s excellent temperature regulation and odor resistance. Though it’s not the most breathable option for intense activities, it's a great four-season choice for those who want merino benefits without the usual durability drawbacks.
Warmth

Warmth

3/5
Breathability

Breathability

3.5/5
Durability

Durability

4/5
Comfort

Comfort

4/5
Odor Resistance

Odor Resistance

4.5/5
Sustainability

Sustainability

1.7/5

Fabric(s)

78% merino, 22% polyamide

Fabric weight

150 g/m²

Weight

6.7 oz.

Variations

Half-zip hoody

Pros

The benefits of synthetics but with the hand feel and odor resistance of merino.
Very durable despite the thin build.
A great merino base layer for high-output activities and mild conditions.

Cons

Expensive, even for a merino blend.
Not warm enough for low-output activities in cold temperatures.
Lacks any added venting, which is often seen in merino-synthetic blends at this price point.

For this season's top models, see our guide to the Best Base Layers.

The Black Diamond Solution 150’s 150-gram, predominantly merino build provides reliable midweight warmth, making it a great option for cool-to-cold conditions. On a resort skiing trip to Grand Targhee, I wore it under an insulated ski jacket in mid-20s temperatures, and it kept me perfectly comfortable—warm but never stifling. Another Better Trail tester layered the Solution 150 under a wind jacket while hiking in blustery Patagonia and found it comfortable throughout the day, whether moving at a steady pace or pausing for trailside breaks.


Compared to a 100% merino base layer with the same 150-gram fabric weight, the Solution’s addition of 22% polyamide (a nylon-like synthetic) makes it slightly less warm but improves breathability and moisture-wicking. This versatility makes it an excellent choice for cool shoulder-season days or as a next-to-skin layer for winter activities. However, it’s less insulating than heavier options like the 250-gram Smartwool Classic Thermal; on the other hand, the merino blend—adept at trapping body heat—can feel too warm in mild temperatures.

I was impressed by the Solution 150’s ability to handle a range of temperatures, both internal and external, and found it more breathable than a 100% merino base layer. While merino naturally wicks moisture and breathes well, it’s also warm and slow to dry—meaning it pulls sweat off your skin but can stay damp. The Solution’s synthetic blend helps mitigate this by drying faster and improving breathability without sacrificing too much warmth. I hiked in the Solution 150 with a wind jacket in mid-50-degree, windy conditions in Patagonia, and it stayed comfortable without building up too much heat. That said, like any predominantly merino base layer, it’s not my first choice for high-output activity, but if you’re keeping your heart rate relatively low, it offers an impressive temperature range.

The Solution 150 is one of the most durable merino base layers I’ve worn, thanks to its NuYarn construction. By wrapping a nylon core with thin merino fibers, NuYarn creates a fabric that is significantly stronger than 100% merino. After multiple multi-day backpacking trips and frequent wear under a climbing pack, my Solution 150 is still hole-free—whereas a comparable 100% merino base layer, like the Smartwool Classic Thermal, almost certainly would have developed holes by now. Pure merino layers tend to pill and thin out quickly with repeated use, especially under backpack straps, but the Solution 150’s synthetic reinforcement makes a noticeable difference. If you love merino but hate how quickly it wears out, this is a serious upgrade.

I really like the fabric on the Solution 150—it’s mostly merino wool with 22% polyamide, which makes it less scratchy against the skin than a 100% merino base layer. It also feels smoother and slightly more structured. Not all merino blends are created equal: compared to the Smartwool Intraknit Thermal (53% merino, 45% polyester, 2% elastane), the Solution 150 has a looser, less skin-tight fit, making it fade into the background more—something I appreciate for all-day comfort. Of course, it’s not as silky soft as a Le Bent merino-bamboo blend, but it’s still cozy, breathable, and comfortable for extended wear.

Despite containing 22% polyamide, the Solution 150 performs just like a 100% merino base layer when it comes to odor resistance. After four days of backpacking, I was surprised that the shirt didn’t smell at all—something that’s nearly unheard of with fully synthetic layers. In comparison, a 100% polyester base layer like the Patagonia Capilene Midweight usually starts to stink after just a day or two. The Solution 150’s merino-dominant blend does an excellent job of keeping odors at bay, making it a reliable choice for multi-day trips where washing isn’t an option.

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Longevity

Choosing durable outdoor gear and keeping it in use for longer is one of the best ways to reduce environmental impact. Our proprietary longevity rating assesses factors like overall build quality, materials, fabric denier, component durability, and real-world performance. A green check indicates that we expect the product to be long-lasting relative to its peers, a yellow check mark indicates average longevity, and a red X indicates a product that may have a limited lifespan.

Tester: 6’1” 160 lb.; 38 ¼" chest; 31” waist
Size tested: Men’s Large

I normally wear a men’s Large and opted for the same in the Solution 150. The fit is snugger than other merino base layers I’ve used, particularly in the sleeves, which felt a little short when using the thumb loops. It wasn’t restrictive, but layering it over a standard-sized t-shirt caused the t-shirt to bunch up awkwardly and stick out at the bottom. That said, I don’t want to paint the picture that the Solution 150 is a skin-tight layer. Compared to base layers like the Smartwool Intraknit Thermal or The North Face Summit Series Pro 120, it isn’t nearly as tight—it offers a fitted feel without the second-skin compression of those options. Still, it’s form-fitting enough that I wouldn’t wear it on its own as my first choice. If you prefer a looser fit or want more flexibility with layering, consider sizing up.

REI Co-op Merino 185 ($80): Budget-Friendly Merino
The REI Co-op Merino 185 is a 100% merino wool base layer that delivers natural softness, breathability, and odor resistance. However, it doesn’t match the durability of the Solution 150’s NuYarn blend and is more prone to pilling and developing holes over time. It also has a slightly scratchy feel compared to the smoother, more structured Solution 150. If you’re looking for an affordable, all-natural merino option and don’t mind sacrificing longevity, the REI 185 is a solid choice for midweight warmth. That said, for those who want the best of both worlds—merino’s performance with added durability—the Solution 150 is the clear winner. For a deeper dive, read our REI Co-op Merino 185 review.

Smartwool Intraknit Thermal ($130): High-Output Moisture Management
The Smartwool Intraknit Thermal Merino base layer is designed for high-output activities, blending 53% merino wool with 45% polyester and 2% elastane. Thanks to its body-mapped mesh ventilation, it outperforms the Solution 150 in moisture-wicking and breathability, making it ideal for high-exertion pursuits. Its slim, athletic fit enhances moisture transfer and minimizes bulk, though it may feel restrictive for those who prefer a more relaxed cut. If you need maximum breathability for intense activities, the Intraknit Thermal is a top pick. But for those who want a more versatile, durable, and less compressive base layer for a variety of conditions, the Solution 150 is the better all-arounder. For more, read our in-depth review of the Smartwool Intraknit Thermal.

Black Diamond Solution 150 ($135)
Chest and logo of Black Diamond Solution 150 Merino Base Layer Crew
4.5/5

The merino/polyamide Solution 150 features a sleek and durable face fabric that effectively resists abrasion. However, it’s pricier than most and doesn’t feature any venting, which can prove helpful for active use.

Fabric(s)
78% merino, 22% polyamide
Fabric weight
150 g/m²
Weight
6.7 oz.
Variations
Half-zip hoody
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Warmth

3/5
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Breathability

3.5/5
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Durability

4/5
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Comfort

4/5
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Odor Resistance

4.5/5
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Sustainability

1.7/5
REI Co-op Merino 185 ($80)
Woman packing car in REI Co-op Merino 185 LS Base Layer Top
4/5

The Merino 185 is REI’s 100% merino base layer. The 185-gram weight is a nice middle ground between light and heavyweight alternatives. However, it’s not as soft as we’d prefer and won’t hold up to heavy use as well as merino-nylon blends.

Fabric(s)
100% merino wool
Fabric weight
185 g/m²
Weight
8.2 oz.
Variations
Half-zip
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Warmth

3.5/5
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Breathability

3/5
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Durability

2/5
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Comfort

3.5/5
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Odor Resistance

5/5
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Sustainability

5/5
Smartwool Intraknit Thermal Merino ($150)
Showing the fit of the Smartwool Intraknit Thermal Merino Base Layer Crew
4.8/5

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.

Fabric(s)
53% merino, 45% polyester, 2% elastane
Fabric weight
200 g/m²
Weight
7.3 oz.
Variations
Crew, quarter-zip
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Warmth

4/5
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Breathability

4/5
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Durability

3.5/5
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Comfort

4.5/5
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Odor Resistance

4.5/5
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Sustainability

2.4/5

Is the Solution 150 for You?

The Black Diamond Solution 150 is a great base layer for those who want the performance of merino without its durability tradeoffs. During testing, its NuYarn construction lived up to its claims, proving significantly more resistant to pilling, stretching, and holes than 100% merino. Hikers, skiers, and backpackers will appreciate its versatile midweight warmth, which works across all four seasons. That said, there are better merino blends for high-output activities (like the vented Smartwool Intraknit Thermal), and not everyone will love the Solution 150’s snug (but not skin-tight) fit. But for a soft, odor-resistant, and breathable midweight base layer built to last through repeated use and demanding conditions, it’s an excellent choice.

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