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M's Runterra LS Tee in Canyon

Regular price $62
Unit price  per 

Sustainable materials, responsibly made.

  • Canyon Topo

  • Astral H2O

  • Plateau

  • Sage

  • Color Canyon

    Color Canyon

    Color Canyon

  • Color Canyon

  • Astral

M's Runterra LS Tee in Canyon

Only 1 left in stock!

Aron wears size M and is 5'11" Athletic fit, Size Chart
Complete the look with the M's 5" AFO Middle Short

Embedded with volcanic ash for active odor-control and thermoregulation, this lightweight long sleeve has the look and feel of cotton with added performance benefits. Read more

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behind the design

behind the design



Poly with volcanic ash

Supima cotton


This is not your typical shirt. Runterra is a blend of US-grown, long-staple Supima® cotton — which is stronger and softer than typical cotton — with a special polyester that has been blasted with volcanic particles to enhance odor-resistance, speed up dry time and provide greater thermoregulation. Yes, it has volcanic particles in it and no, you will not feel them. The fabric is incredibly soft, comfortable and durable yet lightweight, and is intended to be worn repeatedly between washes to reduce water use.



Premium cotton
Made from US-grown, Supima® cotton for superior softness, strength + durability

Active comfort
37.5® polyester with embedded volcanic ash provides enhanced heat + moisture regulation as well as odor-resistance

New sport raglan
Signature raglan sleeve design keeps seams off the top of the shoulders for comfort

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

materials + specs

materials + specs

75% Supima® cotton, 25% 37.5® tech polyester

147g / 5.2oz (M's Medium)

Garment made in Vietnam

care instructions

care instructions

Wash cold with like colors

Machine dry low or hang dry for best results and lifespan of the garment

Heads up — Circuit Knit is not pre-shrunk

Some shrinkage may occur in the wash as Circuit Knit fabric is made of more than half natural fibers.

Fabric Callout

Fabric Callout


A lightweight yet resilient fabric that wears like soft cotton with the added performance of active odor-resistance and thermoregulation — thanks to embedded microscopic volcanic particles.

Shop All runterra



Runterra is made from premium, long-staple Supima® cotton which is 50% longer and up to 45% stronger than other cottons (and softer too). The stronger the fiber, the more durable the garment, and therefore the more it can be worn. Supima® cotton is grown by a select few family farms that utilize advanced water and soil management techniques to reduce consumption and ensure the health of the land.

Runterra fabric 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 13 reviews
love this longsleeve

I ordered this in size medium and was stoked with the fitting. I've taken it out for long runs on the road and on the trail with without a layer underneath and it fit well untucked. I mention untucked because I found that when it was tucked in, the large graphics on the back sticked more to my skin when sweating or in the rain. I wonder if it has to do with the amount of ink or the ways the graphics were screened on the shirt that it creates this feeling. If worn normally, I found that this occurred less so when not tucked in. Other than that little detail, the shirt feels great!

Amazing fit and feel

This is my first Janji piece. Totally loved it. The feel of natural fibers is unbeatable.


M's Runterra LS Tee in Sage

Great fit long sleeve

Lightweight long sleeve t-shirt great for the cooler NC morning in the winter.

New LS Convert

I've never liked running in LS before. In the past, I would just rather take a light jacket. But this fabric makes me think differently. Very breathable and soft. Yes the sleeves are very long, but I just tuck my hands in them when I'm cold and scrunch them up when I'm too hot. Perfect piece for those transition weathers, and a great layer to add to your colder runs.