This Pk maX endurance Racerback Tank has a comfortable feel to it and a relaxed fit. Made of 100% microfiber polyester. Full spectrum performance - trusted by professional athletes and the U.S. Marine Corps! Our patented fabric is engineered for maximum comfort and airflow with inherent antimicrobial and moisture-wicking technology to keep you looking and feeling fresh without harsh chemicals or finishing agents. Lightweight and durable, this tank moves and stretches with your body without pollutive elastics so you can elevate your brand in confidence and style.