A hat brim is that part of a hat that extends outwards and to the side of the head, protruding from the base of the crown. Hat brims run around the whole of the crown and come in varying widths. It is also called a bill. The outer edge of the brim may have trim made of leather, silk or ribbon material and is known as the brim binding.
The brim protects the eyes from both sun glare and precipitation. The broader the brim, the greater its protection function, but the easier it is for the hat to blow off due to the larger surface area available for the wind to act on.Hat brims are often decorative, for example, on very wide women´s hats.
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