A Henley shirt is a collarless pullover shirt, characterized by a round neckline and a placket about 3 to 5 inches (8 to 13 cm) long and usually having 2–5 buttons. It essentially is a collarless polo shirt. The sleeves may be either short or long, and it can be made in almost any fabric, although cotton, cotton-polyester blends, and thermals are by far the most popular. Henley shirts are generally regarded as menswear, but women's versions have appeared as business casual and casual wear as well.