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M's Swift Tech Mockneck LS in Atlantic

Regular price $66 Sale price $50
Unit price  per 

Sustainable materials, responsibly made.

  • Color Atlantic

    Color Atlantic

    Color Atlantic

    Color Atlantic

  • Astral

M's Swift Tech Mockneck LS in Atlantic

Aron wears size M and is 5'11" Slim fit, Size Chart
Complete the look with the M's Groundwork Flyby Tight

The Swift Tech Mockneck LS is a an ultra-soft, moisture-wicking, alpine inspired base layer with the enhanced benefits of merino and Polygiene® anti-odor control. Designed for repeat use between washes, you can wear it as a stand alone top or as your bottom layer. Read more

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behind the design

behind the design






Fitted but not skin tight, the Swift Tech Mockneck LS is meant to function on its own as a long sleeve top or as an optimal base when layering up. The fabric breathes and excels at wicking moisture swiftly away from the body and dispersing it along the fabric face for faster drying. The ultra-soft poly-merino jersey, while intended for high-output in colder pursuits, is thermoregulating to maintain comfort through a wide flux of temps. With alpine-inspired styling and the addition of Polygiene® anti-odor control, this essential cold weather layer can be worn more and washed less.



Moisture-wicking comfort
Ultra-soft, thermoregulating merino/poly jersey provides fast moisture-wicking management to quickly move sweat + heat away for comfort during prolonged efforts

Stays fresher longer
Polygiene® permanent anti-odor control keeps the fabric fresher for longer, so you can use it more between washing — reducing water + energy consumption

Quick dry
DriRelease jersey speeds up dry times

Wear it on its own or as a base
A snug but not skin-tight fit makes for super easy layering and wearability on its own

Ergonomic seaming
Contoured arm hole with racerback seams allow for freedom of movement

Alpine inspired styling
Mockneck style adds extra neck protection with our signature tonal ladder stitch on back

Better thumb slits
Integrated thumb slits built into the cuffs essentially disappear when not in use

Hang it up
An elastic locker loop is integrated into the back collar 

materials + specs

materials + specs

Swift Tech with Polygiene® anti-odor control
84% polyester, 11% merino, 5% spandex drirelease

194g / 6.8oz (M's Medium)

Garment made in Vietnam



Swift Tech is treated with Polygiene® anti-odor control to inhibit and prevent the growth of bacteria that causes stink. Studies show that washing and caring for garments makes up 2/3 of the environmental footprint over the lifespan of apparel — by wearing more and washing less, even just wearing something twice between washes, can save energy and water, reduce CO2 emissions and minimize micro-plastics.

Swift Tech is also OEKO-TEX® certified meaning it is free from harmful chemicals and is fabricated in a way that meets a high environmental standard.

Learn more about our sustainable initiatives here.

Customer Reviews

Based on 21 reviews
Great base layer

I bought this for my husband and he loves it. It is super lightweight, and it wicks well. He's worn it for running, cross country skiing, and hiking high peaks. Really a great piece of clothing.


I don’t write many reviews, but this is the first piece of clothing that made me say ‘holy sh*t’. I’ve run in the shirt three times in mid-20s weather with just a windbreaker shell and I was almost too warm. If you want a good cold weather base layer, buy this shirt.

My Favorite

I love these. Soft and smooth. They feel great running in and lounging around. Sizing is exactly as described. I would love to have this in more colors. The cut is excellent. Not too loose. Not too tight.

MockNeck is Fantastic

This was my second purchase from you. I have ordered the same product twice now, in each color you offer.

Unfortunately, I was not able to enjoy Black Friday price reductions in the second order, made about 5-days before you offered discounts.

I feel like a silly consumer.


M's Swift Tech Mockneck LS in Astral