This marks the beginning. A breakthrough of what is to come. All sizes are all in men's sizes. Shirt pictured in promo shots is size Medium. Fabric: 20 Single, 5.5 oz. 100% Combed Ring-Spun Cotton, Soft-Washed Heathers are 60/40 Cotton/Poly. Athletic Heather is 85/15 Cotton/Viscose. Features: Ultra Soft Hand, Side-Seamed, and Tighly Knit.