Polo T-Shirt The U.S. Polo Assn. Classic Series is defined by quality and tradition : 1) 100% Premium Cotton: High-quality pique knit for maximum airflow and natural comfort. 2) Versatile Style: A clean, solid design that pairs effortlessly with denim, chinos, or shorts. 3) Classic Fit: Designed with a traditional ribbed collar and a sturdy two-button placket.