The Pace Air Tank is built for high-output activity in warm or humid conditions, combining an ultralight Rerun Jersey fabric with a slim athletic fit that moves freely without restriction. Made from 100% recycled polyester, the superfine knit resists snagging, dries quickly, and stays comfortable during extended efforts. Flat seams are positioned to minimize chafing, making it a functional choice for running, fast-paced hiking, or mountain biking.