Polos is a term used to refer to a type of shirt or a style of shirt collar. The word is commonly used in clothing parlance to describe a short-sleeved or long-sleeved shirt, typically made from cotton, with a collar that buttons at the neck. Synonyms for polos include t-shirts, button-down shirts, rugby shirts, and Henley shirts. T-shirts are often short-sleeved and made of cotton or a cotton blend. Button-down shirts are typically made of dressier materials and have a collar that buttons down the front. Rugby shirts are similar to polos but typically have horizontal stripes and a small collar. Henley shirts resemble polos but have a placket with buttons instead of a full collar.