This Ariat men's performance shirt works well for both the winter and the summer. The fabric has an SPF blocker in it, to protect you from the sun's harmful rays. The fabric also is fast drying, so not only does it wick moisture, but it keeps you dry. The inner yokes are a soft nylon mesh to keep the shirt from sticking to you when you sweat. Greater arm mobility means that this shirt was designed to feel comfortable, even when you lift your arms over your head.