We were psyched to try out the Rab Merino+ 160. The blend of merino wool and polyester, combined with a slick look and lightweight, is what caught our initial attention. Putting this base layer on over our heads, we were impressed with its comfort and the slim fit. Through our trips to the backcountry, we loved the exceptional breathability and fast drying speed of this thin top. It's not mega warm, but it was precisely what many fall and spring conditions demand. Our biggest complaint was its durability, which we found to be lacking. However, its excellent performance in most other categories and lightweightedness convinced us of its exceptional merit, therefore winning our Top Pick for Lightweight.
Rab Merino+ 160 Review
Cons: Not very warm, low durability
Our Analysis and Test Results
The blended fabric and thoughtful design of the Merino+ 160 more than convinced us over our testing period that this model deserves applause. Weighing only 7.5 oz and featuring a fabric weight of 160 g/m², it provides excellent breathability, superior comfort, and surprisingly good layering ability. It's not extremely warm, but if you don't need the extra insulation, our Top Pick for Lightweight is a smart choice. It does cost $110, which was the second-most expensive long underwear top in our laundry heap.
We don't all live in the Arctic Circle or Minnesota, and therefore probably don't need the warmest base layer for three-season adventures. Enter the Merino+ 160. With a fabric weight of 160 g/m², it is suited for fall, spring, and the edges of winter. On its own, we were able to wear it down to 40-45°F while remaining moderately active. We hiked in temperatures hitting the 70s without any problems, too.
Several design details added some warmth in more subtle ways. The superior fit of this model helped to control the microclimate between our skin and the shirt. With long sleeves and an adequate torso length, our wrists and bellies were never exposed to cool air when moving through the backcountry. This model also has a drop tail for a happier bum and to help it stay tucked into pants. The back of the zipper teeth are prevented from skin contact by an extra strip of material sewn in place, and the metal slider pull tab won't unpleasantly chill your neck due to a sleek zipper garage.
This thin fabric was one of the best in our base layer selection for transmitting moisture away from our bodies. In the backcountry, we hiked for hours on end with a heavy pack in moderate temperatures, but never felt any sweat condensing on the inside of this shirt. Any moisture we produced was immediately moved to the external environment.
In our indoor workout test, we worked up a good sweat, but it only took five minutes to be back to dry inside this master of exhalation. In all, this shirt does very little to deny the laws of thermodynamics, and we love that.
Comfort and Fit
We like the design and placement of the flatlock seams. They are thinner than most of the other models and placed strategically to avoid chafing anywhere, such as the shoulders and under the arms. The huge gussets along the sides and under the arms attributed to this top's unhindered mobility. Due to its weight, fit, and superior design, this model is one of the least restricting ones. Nice work, Rab! The Merino+ was one of the best-looking tops for around town, too.
After thoroughly saturating this shirt, it took 13 hours to completely dry, which was one of the fastest dry times recorded. We credit its thin fabric to a large part of its success. If you ever manage to sweat more than this breathable top can handle, rest assured that it will dry faster than the majority of alternatives.
The biggest drawback of this Rab top lies in its weak durability. Starting with the fabric, despite being reinforced with 35% polyester, it feels less sturdy than fully synthetic tops of similar fabric weight. However, after three months of extensive use and abuse, we didn't find any wear or tear on the fabric.
The seams were another story, though, and a large reason this product scored low in this category. The hems at the bottom of the sleeves and the shirt bottom are especially susceptible to ripping and tearing loose. We found several points where the threads were coming loose at the end of our testing period; although it didn't have any effect on the performance of this top yet, we expect that it will come at some point down the road. Also, the flatlock seams didn't instill us with great confidence regarding their longevity. We think this already great product could increase its value by putting a little more care and sewing mastery into its seams.
For being a thin, slim-fitting product, the Rab 160 model gets along well with others. It slides under mid-layers and jackets easily and stays in place when moving around as a first layer. It also stretches nicely to fit over next-to-skin t-shirts and base layers with minimal bunching in the armpits. We didn't notice any loss of mobility when layering, but it did lose a bit of comfort when layered over other products. It won't fit over thicker base layers very well, either. But then, why would you want it to?
We recommend this base layer for almost any form of activity in cool temperatures and even moderate activity in warm environments. Fall and spring are the perfect seasons for the Merino+ 160. Being quick to dry, this is also a good option for wetter, sweatier climates where you need a base layer, as well as water sports such as kayaking or canoeing trips. It resists odors fairly well and looks good too, making it a good option for the backcountry and around town.
This product isn't cheap, costing $110. We think that's a lot to spend on a shirt, but if you want top performance from a lightweight base layer, you won't find a better model than this one. Rab seems to have a penchant for high-quality designs, and their prices often follow suit. Although it is expensive, we still find a lot of value in this excellent product.
We are big fans of the Merino+ 160 by Rab, as we appreciated a model that could handle the upper range of temperatures for base layer use very well. It breathes incredibly well, dries fast, and fits and feels great on our torsos. We liked the good looks this model provides when moving around social and urban environments, too. If these are qualities you want in your next base layer, we highly recommend our Top Pick for Lightweight.
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Most recent review: December 19, 2016
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