Biodegradable

M's Runterra Bio Long Sleeve

Odor-resistant + thermoregulating top for daily active wear
$42 $64

48 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 significantly faster than conventional polyester which takes over four hundred years.

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: Obsidian
Size
Athletic fit
Features

Biodegradable
Runterra Bio is powered by a specially formulated 37.5® polyester with enhanced biodegradation to break down into bio-based compounds significantly faster than conventional synthetics 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

Weight
147g / 5.2oz (M's Medium)

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.

Enhanced biodegradation

Most tees take hundreds of years to decompose. Ours is made from an innovative polyester that breaks down in as few as 4 years in a nitrogen-rich environment (i.e. a landfill, not your closet).

Backed by our 5-year Guarantee

We make gear that lasts. If your Janji gear doesn't due to any defect in workmanship or material, we promise to repair it, replace it, or give you store credit for it. Learn more about our guarantee.

Customer Reviews

Based on 48 reviews
67%
(32)
19%
(9)
10%
(5)
4%
(2)
0%
(0)
D
Donald R.
Wear it for: Running, Cycling, Everyday wear
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
Lightweight, roomy at the shoulder

This is a great garment. I would absolutely buy another if it appeared in a different color (I went for Obsidian). One detail that provides much extra comfort is the shoulder gusset pieced in at the back of each sleeve. Genius!

s
s.
Wear it for: Running, Everyday wear
Product Fit: Spot-on
Height: 5'7" to 5'9"
Usual Size: M
Size Purchased: M
Great shirt

Love this shirt. Got it for a good price.

A
Anonymous
Wear it for: Running, Hiking, Climbing, Everyday wear
Product Fit: Spot-on
Height: 6'3" or taller
Usual Size: XL
Size Purchased: XL
nice shirt

love the material and fit. Slim, lanky, athletic build. arms and hem are plenty long. super soft and pretty lightweight material, feels pretty premium. going to get more someday for sure.

J
Jason L.
Wear it for: Running, Everyday wear
Product Fit: Spot-on
Height: 5'10" to 6'0"
Usual Size: M
Size Purchased: M
Light weight long sleeve

Some of the reviews indicated that this shirt runs larger but I found the medium to be ideal. I’m 6’ 165 and prefer a snug fit and so I ordered a medium. The medium stops right below my waist and has the tightness I prefer for running.

M
Mark S.
Wear it for: Running, Climbing, Everyday wear
Product Fit: Spot-on
Height: 6'0" to 6'2"
Usual Size: L
Size Purchased: L

Great shirt

K
Keaton W.
Wear it for: Everyday wear
Product Fit: Spot-on
Height: 6'3" or taller
Usual Size: L
Size Purchased: L
Good shirt

Great shirt, love the design just would like it a little bit longer (but I am quite tall so this isn’t a big issue)

D
Dianne H.
Wear it for: Running
Product Fit: Spot-on
Height: 6'3" or taller
Usual Size: L
Size Purchased: L
Got this for my Son

Awesome shirt! Thankyou!!

S
Sully
Wear it for: Running, Everyday wear
Product Fit: Spot-on
Height: 6'0" to 6'2"
Usual Size: L
Size Purchased: L
This shirt rocks!

Very comfortable and breathable! I used it as a surf shirt recently and it worked great! Love Janji!!!

W
WILLIAM B.
Product Fit: Runs large
Height: 6'0" to 6'2"
Usual Size: M
Size Purchased: L

Bill

B
Bill
Runterra Great Shirt

Have only one run in the shirt in a 45 F degree day it was perfect. Of course, I can wear it again without washing it. Janji has fantastic products. I am a fan.