95% polyester, 5% elastane. Smooth, soft anti-pick, anti-pill fabric has a cleaner, snag-free finish. 4-way stretch fabrication allows greater mobility in any direction. Anti-odor technology prevents the growth of odor causing microbes. 30+ UPF protects your skin from the sun. Durable rib-knit collar. Athletic loose fit. Size equivalent: XS/0-2, SM/4-6, MD/8-10, LG/12-14, XL/16, 2X/18. Embroidered with the IC Bus logo.