A sports visor, also called a sun visor or visor cap, is a type of headgear that consists of a bill that covers the eyes, attached to a headband used to secure it to the head. Some visors have a very large bill that can shade most of the entire face, while others have a bill similar to that of a baseball cap. Sports visors are often worn in hot sunny weather, where shading the eyes and face is desirable, but where trapped heat from a traditional baseball cap is not wanted. Some hats have a zip-off crown allowing them to be worn as a hat or a visor.