Vaiden Triton - Men's Long Sleeve Workout Shirt Using Patented Astronaut Technology 100% Polyester HIGH QUALITY MATERIAL: The Vaiden athletic performance long sleeve shirt for men is made with 100% polyester. Its light-weight, durable fabrication features flat lock stitching and is non-irritating and non-chaffing on the skin. ASTRONAUT HEAT REGULATION TECHNOLOGY: The Triton uses a heat management technology that was originally developed for astronauts to help regulate their temperatures while in outer space. The technology, Thermocules, is both patented and certified. COMFORTABLE FIT AND DESIGN: The Triton fitness shirt features a loose, comfortable fit around the torso, and a tighter fit around the arms. Details include contrast paneling and a raglan sleeve design. ARM POCKET: A zippered pocket on the left arm sleeve provides storage to keep your personal belongings with you while you work out. DIRECT-TO-CONSUMER: This technology is not typically manufactured by conventional athletic performance activewear brands due to its high cost. By distributing our products direct-to-consumer, we are able to offer this premium technology at attainable pricing.