The Pace Air Tee is built for high-output activities like running, fast hiking, and mountain biking where breathability and freedom of movement matter most. Its Rerun Jersey fabric — an ultralight, superfine knit made from 100% recycled polyester — stretches with your body, resists snagging, and dries quickly to keep you comfortable through extended efforts. The slim fit stays close without restricting movement, while flat seams are positioned to minimize chafing during prolonged wear.