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Janji Collective

New Sizing Tools

Womens Fit Guide
biodegradable
run everywhere
guarantee
free shipping on
orders over $75
free 60 day exchanges
+ no-fuss returns

Runterra Bio Tee GFX

Runterra Bio Tee GFX

Odor-resistant + thermoregulating top for daily active wear

COLOR >>  
M's Runterra Bio Tee GFX

Past Season Deals

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Hurry, only 2 left in stock!

THIS PRODUCT IS ONLY AVAILABLE TO JANJI COLLECTIVE MEMBERS

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JOIN JANJI COLLECTIVE

THIS PRODUCT IS ONLY AVAILABLE TO JANJI COLLECTIVE MEMBERS

Join now to unlock access

JOIN JANJI COLLECTIVE
run everywhere guarantee
free shipping over $75
free 60 day exchanges
Cal is 5’9” // they wear size SWilliam is 6’1” // he wears size M 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 as few as four years. Conventional polyester takes up to 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 as few as 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 straight 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

Modified raglan design
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
103g / 3.6oz (M’s Medium)"

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 12 reviews
67%
(8)
25%
(3)
0%
(0)
8%
(1)
0%
(0)
J
Jason

Great shirt! Great fit!

L
Leslie L.
Wear it for: Everyday wear
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
Love the color but not a fan of the neck

Love the color and feel of the fabric but not a fan of the loose neck

S
Steven H.
Wear it for: Running, Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: M
Size Purchased: M
It's Wonderful! I love the design on the back

I love the color and design of this shirt. I wore it on a hot day so it was nice and comfy. It fit just right.

O
Omar A.
Wear it for: Running, Hiking, Camping
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: L
Size Purchased: L

M's Runterra Bio Tee GFX

M
Mike C.
Wear it for: Running, Hiking, Camping, Climbing, Cycling, Everyday wear
Product Fit: Spot-on
Height: 6'0" to 6'2"
Usual Size: M
Size Purchased: M
Amazing shirt

My new favorite running shirt

A
Anonymous
Wear it for: Running, Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: XS
Size Purchased: XS
Jordan

Wear the XS all the time as a guy fits great! Highly recommend for running and wearing around.

A
Abhi K.
Wear it for: Running, Hiking, Everyday wear
Product Fit: Runs large
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Amazing design and fit

The material, design and fit are amazing. Great for warm weather. Me and my partner both wore the same T and both of us liked it. Runs slightly large but not too much.

G
Gabe
Wear it for: Running
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: L
Size Purchased: L
Absolutely love this

Great design, comfortable yet (seemingly) durable material. I love the artist collab/limited edition drop model too.

J
Joseph L.
Wear it for: Running, Hiking, Mountain Biking, Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S
Comfy Tee, not great in warmer weather

Great design, fits well and comfy. A little to much cotton in the blend for the climate I live in. Gets pretty heavy when sweating.

A
Adam A.
Wear it for: Everyday wear
Product Fit: Runs large
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S

Shirt it too long