Janji Runterra Bio Tee in obsidian, size small. Super soft, thermoregulating and odor-resistant. The perfect travel ans layering tee! Perfect condition. Description from Janji: 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.