Run in it, sweat in it, live in it, then biodegrade it! The Janji Men's Runttera Bio GFX Long Sleeve is the first synthetic blend running shirt that will biodegrade like a 100% cotton tee. The new, innovative fabric offers enhanced moisture and odoUr control while still providing premium comfort and versatility. When you're done with your run, hang it up with the elastic locker loop integrated onto the back neck.