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Runterra Bio Long Sleeve

Runterra Bio Long Sleeve

Odor-resistant + thermoregulating top for daily active wear

COLOR >>  
W's Runterra Bio Long Sleeve

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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 $55
free 60 day exchanges
Gabby wears size S and is 5'08" Abigail is 5'7" and wears size S Chi-chi is 5'11" and wears size M Talia is 5'8" 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.
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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

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

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

Garment made in Vietnam

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 42 reviews
81%
(34)
12%
(5)
5%
(2)
2%
(1)
0%
(0)
M
Mia
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: XS
Size Purchased: XS
Love the fabric

Ive bought Runterra long sleeves before, but this updated fabric is awesome. It’s way softer than the older versions without sacrificing the technical features. This will be a winter staple.

D
DEBRA W.
Wear it for: Everyday wear
Product Fit: Runs small
Height: 5'4" to 5'6"
Usual Size: M
Size Purchased: L
Long sleeve tee

Love this shirt! I bought a large but normally wear a medium. I do think it runs a little small, but getting the large was a good call. I received lots of compliments! Would buy again!

S
Sara D.
Wear it for: Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: S
Size Purchased: S

W's Runterra Bio Long Sleeve

A
AA
Wear it for: Running
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Lightweight, doesn't ride up!

The fit is great (slim but not skin tight), the fabric is incredibly lightweight but warm enough for days when there's a slight chill, and it passed my biggest test by not riding up over the course of the run. I'm pleased with this purchase.

L
Lily A.
Wear it for: Hiking, Climbing, Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: M
Size Purchased: M

I love it

L
Lori J.
Wear it for: Running, Hiking
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: XS
Size Purchased: XS
Super comfortable

Like the light weight and fits perfectly not too loose but allows movement

M
Michelle
Wear it for: Hiking
Product Fit: Runs large
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: XS
Great Active Long Sleeve

This is a great long sleeve for any activity. I play a lot of volleyball and I use these long sleeves most of the time. It has a lightweight feel that doesn’t restrict movement or overheats. The extra small fits well, although I am unsure why the sleeves are SOO long. I’m guessing since janji is mainly a running company, long sleeves help? I just don’t get it. The sleeves could have been shorten by at lease 4-5 inches.

C
Camille
Wear it for: Running
Product Fit: Runs large
Height: 5'4" to 5'6"
Usual Size: XL
Size Purchased: S
It’s fine

Feels like smooth cotton, more cold than warm. If that is what they meant by “thermoregulating” then mission accomplished I guess. I was hoping for something that would keep me warm, Fit is fine, maybe a little looser than I was expecting, but length is ok (could be longer, but I am a long torso-ed lady so it’s probably fine for most people and not too short on me, but kind of too wide, but if I had sized down it would certainly be too short).

U
U.M.
Wear it for: Running
Product Fit: Runs large
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
When they say long sleeve, believe it!

The fit of this shirt is odd and very unflattering. It fits ok in the torso. A bit loose in the waist, but ok. The sleeves, however, are at least a size too wide and absurdly long. I bought this on final sale and am unfortunately stuck with it. Now that I look at the pictures again, it doesn't even look good on the model.

C
Cara P.
Wear it for: Running, Hiking, Camping
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
The Perfect Fit!

I love this shirt so much that I now have it in two colors.
I wear it for pretty much everything.
The fit is perfect and flattering and the fabric is really soft