Ball cap

A baseball cap is a type of soft cap with a rounded crown and a stiff peak projecting in front. The front of the cap typically contains designs or logos of sports teams (namely baseball teams, or names of relevant companies, when used as a commercial marketing technique). The back of the cap may be "fitted" to the wearer's head size or it may have a plastic, Velcro, or elastic adjuster so that it can be quickly adjusted to fit different wearers. The baseball cap is a part of the traditional baseball uniform worn by players, with the brim pointing forward to shield the eyes from the sun. The cap is often seen in everyday casual wear.

In 1860, the Brooklyn Excelsiors wore the ancestor of the modern rounded-top baseball cap, which featured a long peak and a button on top, and by 1900, the "Brooklyn style" cap became popular. During the 1940s, latex rubber became the stiffening material inside the hat and the modern baseball cap was born. The peak, also known in certain areas as the "bill" or "brim", was designed to protect a player's eyes from the sun. Typically, the peak was much shorter in the earlier days of the baseball hat. Also, the hat has become more structured, versus the overall "floppy" cap of the 19th and early 20th centuries. The baseball cap was and still is an important means by which to identify a team. Often the logo, mascot, or team's initial was placed on the cap. Usually, the cap was also fashioned in the official colors of a particular team.

The basic shape, including curved peak, is similar to some styles of 19th century sun bonnets.

Fitted baseball caps, those without an adjuster, are normally sewn in six sections, and may be topped with a matching fabric-covered button (also called a squatchee) on the crown. Metal grommets or fabric eyelets are often sewn or attached near the top of each of the six sections of fabric to provide ventilation. In some cases, the rear sections of the crown are made of net-like mesh material for extra ventilation. The peak is typically stiffened by a sewn-in piece of paperboard or stiff plastic.

Baseball caps are made of many types of material and shaped in various styles for different purposes. Major and minor league baseball players wear classic-style caps made of wool (or, more recently, polyester) with their team's simple logo and colors; the logo is usually embroidered into the fabric.

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