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Runterra Bio Tee

Runterra Bio Tee

Odor-resistant + thermoregulating top for daily active wear

COLOR >>  
W's Runterra Bio Tee
size >>

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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 26 reviews
77%
(20)
15%
(4)
4%
(1)
4%
(1)
0%
(0)
C
Chelsea C.
Wear it for: Running, Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S
Solid workout top

I recently moved from Florida to Colorado and wanted more coverage from the sun while working out. I doubt this material would have been comfortable in humid weather but it’s been fantastic in a high mountain desert climate. The shirt itself is very soft and I’ve done weight lifting, hiking, and running in it. I might get another one!

m
mef
Wear it for: Running, Hiking, Cycling, Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: XL
Size Purchased: XL
Perfect Basic For People Doing Stuff

Lightweight and dries fast. Great for hiking, biking, yoga, running, kayaking. I have three of these and could wear them every day. My only gripe is that I wish I could go another size up for a slightly looser fit but alas I am at the very end of their size range :(

M
Mel P.
Wear it for: Running, Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Breathable and comfortable!

I'm a huge fan of the runterra series, both long sleeve and short sleeve options. Looks nice enough to wear out and about, dries quickly, and doesn't retain odor after a sweaty run. Bought it in Jasper and Obsidian and I'm thinking of getting more!

C
Chelsea O.
Wear it for: Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M

W's Runterra Tee

L
Luda K.
Wear it for: Running, Climbing, Everyday wear
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: M
Size Purchased: M

W's Runterra Bio Tee

K
Karina M.
Wear it for: Hiking
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: M
Size Purchased: L
So soft!

This shirt is so comfortable and amazingly soft! I'm always looking for clothing that has a sustainability focus and was so happy to find this when it came time to buy new workout tops. Less guilt for whenever this shirt meets the end of its life but it's very well made that I expect it will have a long life! So far the color is still as beautiful as it was prior to the first wash. I've worn this for hikes and warm weather walks and it's been comfortable. I used the sizing chart and the recommended size on there worked perfectly.

K
Kevin B.
Wear it for: Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: S
Excellent shirt!

This shirt fits me perfectly, even though I am not a W, but rather a small M.
I can sweat in the shirt for several days before giving up and washing it! :)

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.