The Runterra Bio Top combines the comfort of cotton with cutting-edge moisture and odor control. Crafted from a unique blend of 70% Supima® cotton and 30% 37.5® polyester, it ensures superior softness and durability while remaining environmentally friendly. With enhanced biodegradation properties, this shirt breaks down in landfills in under four years, making it a sustainable choice for activewear. Ideal for daily runs and spontaneous adventures, it merges functionality with eco-conscious style.
From the brand: Top Description
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.
Sizing
Gabby is 5'8" and wears size S
Camilla is 5'7" and wears size L
Regular fit ,
Size Chart
Cards
full-bleed
half-split
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)
care instructions
fabric
runterra
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
.
full-bleed
Highlights CP
Title: Runterra Bio Tops
Header: Everyday activewear + style
Description: Cottony-soft feel, odor + thermal regulation, enhanced biodegradation
Best for: daily runs, spontaneous adventures
Fit: regular
Designed for: 45~85+
Shop the: Tee
