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Runterra Bio Tee

Runterra Bio Tee

Odor-resistant + thermoregulating top for daily active wear

COLOR >>  
W's Runterra Bio Tee
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Gabby is 5'8" and wears size S
Camilla is 5'7" and wears size L
Regular fit , Size Chart

Run in it, sweat in it, live in it — then biodegrade it!

The first synthetic-blend running shirt that biodegrades like a 100% cotton tee, our Runterra Bio offers the enhanced moisture and odor control of specially-formulated 37.5® polyester with the comfort and versatility of cotton. This new, innovative fabric breaks down into organic compounds in under four years. Conventional polyester takes four hundred.

Don’t sweat it this tee will only start to biodegrade in anaerobic (oxygen-poor) environments. It breaks down in the landfill, not in your closet.

Explore more

features

Biodegradable
Runterra Bio is powered by a specially formulated 37.5® polyester with enhanced biodegradation to break down into bio-based compounds in under 4 years in an oxygen-poor environment like a landfill

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

Everyday looks
Easy to wear, casual cut with a slightly rounded back hemline

Active comfort
Blended with 37.5® polyester, a special technology utilizing the natural benefits of microscopic volcanic ash to provide enhanced thermal, vapor + odor regulation to maintain body comfort during activity

Wear more, wash less
The natural odor resistance of cotton is boosted by the volcanic particles which "trap" odors so you can put this top through repeated wear

Ergonomic comfort
Shoulder seams are rolled back off the top of the shoulders for ergonomic comfort

Shrinkage is natural
This top is made from 70% natural fibers and is not pre-shrunk so some shrinkage may occur, up to half a size

materials + specs

Runterra
70% Supima® cotton, 30% 37.5® tech polyester

Garment made in Vietnam

Weight
86g / 3oz (W’s Small)

sustainability

Why do biodegradable synthetics matter? 

While we design Janji gear to last and hold up to the demand of years of running, no tee or running shorts should last forever. With this in mind, we are researching innovative ways to improve end-of-life cycle management of our apparel. While we look into longer-term solutions and circular methods — recycle, repurpose and reuse programs — we also know that most textiles are thrown out and end up in landfills. Conventional synthetics, used heavily in active apparel for their high-performance functionality, do not biodegrade in typical landfill conditions. This includes synthetics made from recycled materials, and is why most plastic seemingly lasts forever.

We are seeking solutions to fix this as a performance apparel company that relies on synthetics, including the use of non-ecotoxic biodegradability within our textiles like this new Runterra Bio. This is the first step on a better path forward.

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 for optimal renewability.

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.

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Customer Reviews

Based on 15 reviews
87%
(13)
7%
(1)
7%
(1)
0%
(0)
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K
KC W.
Wear it for: Running, Hiking, Camping
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: M
Size Purchased: M
LOVE

I use this shirt primarily for running but honestly could use as an every day shirt. Normal running shirts start smelling but this does NOT. I have used it for multiple long runs and relays and it literally does not hold smell. Plan on using for backpacking this spring!

M
Michelle
Wear it for: Hiking
Product Fit: Runs small
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: XS
PerfecTee

In love with the runterra T-shirt. It’s comfortable and so flattering. The seam hits at the right length. I ordered the x-small (I’m usually a small, but I sized down for this item), and while it did shrink in the dryer (the product details do warn you about this), it’s still comfy, moveable, and breathable. Want it in every color!

M
Mollie
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: M
Size Purchased: M
Love this shirt!

Love this shirt. Use it for a number of activities. Doesn't hold a lot of smell, firs wonderfully, feel good wearing it! Didn't really want to spend so much for a t-shirt but it's been worth it so far and I'm sure I'll be buying more in the near future.

K
Katja H.
Wear it for: Running, Hiking, Camping, Climbing, Mountain Biking
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
My absolute favorite running shirt!

I love the loose fit and non-plastic feel of this shirt.

A
Anonymous
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
Super comfy! Best Running gear!

Super comfy! Best Running gear!

K
Kimberley
Wear it for: Hiking
Product Fit: Spot-on
Height: 5'0" or shorter
Usual Size: XS
Size Purchased: XS
A great all purpose tee

This was my 2nd W's Runterra Bio Tee. I love it and am extremely happy with my purchase. I just wish there were more colors to choose from as I would buy more!

R
Rosa M.
LOVE

I love this tee! It's perfect for everything. It's light, it's breathable, it doesn't smell, and the colors are fun!

K
KathyM
Nice Tshirt

Super soft, comfortable fabric. Fun design, and representative of a great cause. I really like this shirt!

A
Angela
Great shirt

Super comfy! I don't normally like cotton/cotton blend shirts when I'm active since I sweat a LOT, but this one does a good job keeping me cool and doesn't have that super clingy cotton shirt feel when it's wet.

A
Alex P.
Love This Shirt

This is the first Runterra shirt I've owned, and I love it. It's lightweight and good for both backpacking and hiking. It also is really good at odor control. I took this on a six mile hike, sweated (as we do), and then took it out for a run the next day. Still smelled fresh.