This Under Armour short - sleeve shirt is great for promotional events like employee gift - giving or recruiting. It's designed for men who value both style and comfort. The shirt has a slim, streamlined fit. It's made of 53% nylon and 47% polyester. The UA RUSH infrared tech helps you perform better and recover faster. The nearly sew - free design reduces chafing, and the 4 - way stretch material allows for easy movement. Machine wash it cold with like colors and tumble dry on low.