Vaiden Heliosphere - 1/4 Zip Pullover Mens/Patented Astronaut Technology PREMIUM QUALITY MATERIAL: The Vaiden Heliosphere long sleeve pullover shirt for men is made with 100% polyester. Its fabrication is both thick and soft, yet durable enough for your workouts. The mens sweatshirt also features flat-lock stitching and is non-irritating and non-chaffing on the skin. ASTRONAUT HEAT REGULATION TECHNOLOGY: The Heliosphere mens pullover 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 Heliosphere fitness pullover features a comfortable fit that is slightly roomier than our more athletic specs. SIDE POCKETS: The mens quarter zip pullover features dual zippered pockets that provide storage to keep your personal belongings with you while you work out.