Bought several of these tanks & realized the fit was too small after wearing one - so selling them all so they can be put to good use. From Vuori Site: Built to stand up against the heat, the Zephyr is a muscle tee crafted from performance stretch mesh in a breezy, perforated material for maximum airflow and heated workouts. Great for yoga, running, training and hiking. 4-Way Stretch Moisture Wicking Recycled Material Premium mesh that allows for better stretch and breathability Modern athletic fit Drop Tail Styling Reflective Logo