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The Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve ($85) is a light-weight long-sleeve layer made to go the gap in quite a lot of circumstances. From chilly to heat and from drizzly to dry, this shirt will preserve you snug and searching trendy too.
This long-sleeve base layer’s merino and nylon mix retains it gentle and sturdy with a slim match that even Goldilocks must agree isn’t too tight or too free however is excellent. The shirt is available in males’s and ladies’s variations, with a males’s dimension vary of small to XXL and a ladies’s of XS to XL. Whether or not you’re carrying it as a single layer on a cold morning run, a base layer for cold-weather adventures, or as an off-the-cuff prime on a protracted journey day, it should work its merino magic to maintain your temperature regulated and your stoke excessive.
Store the Girls’s Smartwool Basic All-Season Merino Base Layer Lengthy SleeveStore the Males’s Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve

The Smartwool Basic All-Season Merino Base Layer 1/4 Zip, which is identical because the Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve apart from its zip. Picture: iRunFar/Eszter Horanyi
Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve Material
The Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve is made from merino wool with a nylon core that helps with sturdiness. The pure wool fiber from merino sheep is thinner, softer, and fewer scratchy than common wool and is rather more snug in opposition to your pores and skin. The fibers are inherently good at temperature and moisture regulation and are additionally odor resistant. The pure bends in merino fibers lure air and supply insulation in chilly temperatures. The merino fibers are additionally porous, permitting sweat to flee as a vapor and eliminating that moist, clammy feeling some artificial supplies can have in cooler climate. In brief, the fabric that helps merino sheep thrive in excessive circumstances does the identical for us! For extra particulars about merino wool, take a look at our greatest wool working attire information, the place this shirt was our prime light-weight long-sleeve choose.
Along with merino’s technical functionality, additionally it is environmentally pleasant and biodegradable. Smartwool’s merino comes from New Zealand growers who’re devoted to defending the well-being of the animals, producing ethically sourced wool, and enhancing sustainability and environmental affect.
Many merino activewear items are a mix of merino plus different supplies to boost the merchandise’s efficiency. This shirt is constituted of 87% merino wool and 13% nylon. The merino fibers are spun round a skinny nylon core to create a material that’s stronger and extra sturdy than merino could be alone. The merino fibers are nonetheless subsequent to the pores and skin, permitting the shirt to maintain its priceless moisture and temperature-regulating properties. This shirt’s material is gentle, tender, and really snug when worn each casually and for hours of path working.

A entrance view of the Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve. All pictures iRunFar/Carly Eisley except in any other case famous.
Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve Match
The Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve is available in each a crew neck and 1 / 4 zip match. It’s a slim-fit design that’s splendid for layering. I discovered it to suit near the physique with no sagging or bunching, nevertheless it was not overly tight or constrictive. It’s snug each as a standalone or gentle prime layer in heat to chill circumstances and as a base layer in chilly temperatures. It’s roomy sufficient to suit over a tank prime or brief sleeve shirt however comfortable sufficient to not bunch up below one other layer. I’m usually a dimension small in most producers and located the shirt to run true to dimension for me.
The sleeves have a raglan design with seams angled extra to the entrance of the shirt fairly than proper over the shoulder, eliminating a possible friction level below a pack. The seams wrap towards the entrance of the shirt, giving it a novel look. Smartwool claims this improves the match, and I’ve to say that I agree. The size of the hem and the sleeves have been excellent.
Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve Efficiency
As talked about above, merino wool’s moisture- and temperature-regulation properties are second to none, particularly in colder climate. I’ve worn the Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve shirt by itself in the whole lot from a sunny 60-degree Fahrenheit day to a wet and chilly slog, and the shirt has stayed snug with out feeling muggy or clammy. I ran a 100-kilometer path race within the hills of Pennsylvania in 50-degree F temperatures and on-and-off rain with this shirt over a merino tank prime and stayed snug and heat all day, even regardless of my poor alternative of a non-waterproof jacket. That race actually solidified my love affair with all issues merino!
The shirt additionally works effectively as a base layer, and I’ve discovered it to be very snug when layered below a thicker merino prime, vest, fleece, or sweater for informal put on. It feels heat but gentle in opposition to the pores and skin and is tender with no itchiness. I had no points with any rubbing or chafing from the seams, even when the shirt was layered or worn alone below a hydration pack.
The odor-resistant properties of merino wool make it a implausible alternative for endurance occasions, stage races, and journey. I’ve to say that I’m inherently skeptical of all producers’ claims about their merchandise. Whereas merino’s odor-resistant properties don’t belong to anyone firm, I used to be nonetheless doubtful as to whether or not they could be nearly as good as promised. After giving my shirts a stable sniff take a look at after some very lengthy races and journey days, I can attest to the truth that this shirt has stayed impressively stink-free. It has turn into my go-to for journey days and has stayed dry and odor-free for a number of very lengthy flights and airport sprints.
Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve General Impressions
The Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve has rapidly moved its option to the highest of my long-sleeve layer pile. It’s the excellent weight for these cool days after I want just a little additional heat however gentle sufficient that it stays snug if the temperatures rise. It really works effectively by itself as a light-weight prime layer or a next-to-skin base layer for colder days. It’s pretty skinny, so it should most likely not work for most individuals as a standalone shirt in chilly climate.
The shirt is available in each a crew-neck and quarter-zip fashion and has quite a lot of shade selections that may please everybody from the earth-tone lovers to the Rainbow Brites of the endurance world. That is particularly nice for these of us who need good visibility on street runs or on the paths throughout looking season but additionally desire a impartial shade possibility for informal put on. There are additionally plant-based dye choices within the crew neck for individuals who desire a extra eco-conscious possibility.
The temperature- and moisture-regulating capability of this shirt is spectacular, and the odor resistance makes it a no brainer when laundry choices are few and much between. If you’re in search of a light-weight, versatile layer that may be layered, dressed up, and get you thru a number of wearings earlier than a wash, this shirt is a good possibility. To study extra, learn our greatest wool working attire information, the place this shirt was named our prime light-weight long-sleeve choose.
Store the Girls’s Smartwool Basic All-Season Merino Base Layer Lengthy SleeveStore the Males’s Smartwool Basic All-Season Merino Base Layer Lengthy Sleeve
Name for Feedback
- Do you like merino wool shirts to artificial supplies?
- Is a long-sleeve merino wool layer a part of your cold-weather working setup?
[Editor’s Note: If you’re affiliated (i.e., an employee, ambassador, etc.) with a brand, please share your relation in each of your comments on this article. Thanks!]
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