A cap is a form of headgear. Caps have crowns that fit very close to the head. They are typically designed for warmth, when including a visor used for blocking sunlight from the eyes. They come in many shapes and sizes, and various different brands.
Flat cap (also known as a Kerry cap in Ireland (slang of Paddy cap - see also Caubeen), longshoreman's cap, scally cap, Wigens cap, ivy cap, golf cap, duffer cap, driving cap, bicycle cap, Jeff cap, or in Scotland, bunnet, or in Wales, Dai cap, or in England or New Zealand, cheese-cutter)