A Henley shirt is a collarless pullover shirt, characterized by a 10-centimetre-long (4 in) placket beneath the round neckline, usually having 2–5 buttons. It essentially resembles 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.