W's Runterra Bio Long Sleeve

Odor-resistant + thermoregulating top for daily active wear
£45.00

6 reviews

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.

Color: Riverbed
Size
Regular fit
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.

Customer Reviews

Based on 6 reviews
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M
Micheline B.
Love this shirt!

I waited to truly try out this long sleeve before reviewing because it is very thin. I love that its sustainable and the fit is truly perfect, as someone who struggles with sleeves being short I had no issues with this shirt, and it looks really nice (the obsidian is a lovely color). It is thin but I think that is one of the best things about it. I've run in rain, wore it traveling (along with stress sweats), done surgery in it, washed it in a sink while traveling, and truly wore it and it still looks so nice and I've always been so comfortable in it. If I could wear it all the time I would- I will be buying more.

J
J. Su
Comfortable shirt

Got this shirt for running but it’s so soft and nice I have been wearing it daily, good quality doesn’t get itchy on the seam which is great!

T
Taylor
Wanted to love it!

I love this material and I loved the color I got. My only complaint is that the sleeves were oddly long. I'm keeping the shirt and just rolling them up (3-4 times!), but this was a bit of a bummer for me. I don't have this issue with any other shirts, so this was a random issue.

E
ELW
Comfy cute workout shirt

Super soft and fits great - loose enough to feel not all bound up - but fitted enough to be attractive- more stock in other colors please!

D
Danielle Castaldi
Great technical base layer

Love this shirt for hiking and camping on chilly days/nights. Want to buy it in every color! Love this shirt so much the antiodor and quick dry is amazing!