The Janji Runterra Bio Boxy Tee is a sustainable t-shirt that you can comfortably run and sweat in. This synthetic-blend running shirt breaks down in a landfill, not your closet. The Runterra Bio Tee biodegrades like a 100% cotton tee thanks to the specifically-formulated 37.5® polyester that can break down in four years (but only in an anaerobic or oxygen-poor environment). Conventional polyester, on the other hand, takes over 400 years to break down. Not only is this shirt environmentally friendly, but it is super soft and comfortable thanks to its premium cotton blend. The 37.5® polyester also has microscopic volcanic ash that gives you enhanced thermal, vapor and odor regulation, so you stay comfortable all run long and won’t need to wash it as often. The shoulder seams are rolled back off the top of the shoulders for ergonomic comfort, while the slightly cropped silhouette hits above the hip for a stylish look. The top is made from 70% natural fibers, so some shrinkage may occur. Look great, feel comfortable and help the environment with the Janji Runterra Bio Boxy Tee.