A baseball glove helps you catch a ball. 
A baseball glove helps players catch balls. 

A baseball glove helps players catch balls. 

A baseball glove is a vital tool for players on the defending team. 
Making a great catch often depends on the glove's design. 

Early baseball was played without any gloves at all. 
Design changes helped players make fewer errors on the field. 
Gloves come in many specific sizes and shapes for different tasks. 
A baseball glove is a specialized piece of equipment used by the defending team.
To understand how a glove works, one must understand how it is worn. Players always wear the glove on their non-dominant hand. This leaves the dominant hand free for the precise task of throwing. By convention, gloves are named by the handedness of the player. A right-handed thrower wears the glove on their left hand. This is called a right-handed (RH) or "right-hand throw" (RHT) glove. 
The design of the glove has evolved through several distinct stages. Early versions were not webbed and were not very effective at catching. Some early models were simple leather gloves with the fingertips cut off. These provided extra padding but allowed for the same control as a bare hand. In the early 1900s, manufacturers began experimenting with a "full web." This was a small piece of leather, about 0.5 to 1 inch, connecting the thumb and index finger. 
History shows that glove use was a gradual transition. Early baseball was played entirely without gloves. Players who caught without one were called "barehanded catchers." One of the first players believed to use a glove was Doug Allison in 1870. He used one to protect an injured left hand. In 1875, Charlie Waitt became the first confirmed user by wearing flesh-colored gloves. 
Today, gloves are highly specialized based on a player's specific position. Catcher's mitts are unique because they lack individual fingers, similar to a mitten. They feature extra padding and a hinged, claw-like shape to funnel fastballs into a pocket. 
Pitchers also use specialized designs to gain a competitive advantage. Many pitchers use gloves with closed, opaque webbing. This prevents the batter from seeing their grip on the ball. The grip is important because it determines how the ball behaves in flight. Some pitchers even use gloves with very large patterns. Switch-pitchers, like Pat Venditte, use a unique "switch-thrower's glove." This glove has a second thumb pocket on the opposite side. This allows the player to wear the glove on either hand.
Because of these specialized designs, gloves are measured in different ways. For most gloves, measurement starts at the top of the index finger. The measurement goes down the finger, along the inside of the pocket, and out to the heel. Sizes for these gloves range from small youth sizes to 12 inches for adult outfielders. Catcher's mitts are measured differently. They are measured by their circumference and described by their specific pattern. These variations ensure that every player has the exact tool they need for their job on the field.
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