Polo is a team sport played on horseback in which the objective is to score goals against an opposing team. Players score by driving a small white plastic or wooden ball into the opposing team's goal using a long-handled mallet. The traditional sport of polo is played at speed on a large grass field up to 300 yards long by 160 yards wide, and each polo team consists of four riders and their mounts. Field polo is played with a solid plastic ball, which has replaced the wooden ball in much of the sport. In arena polo, only three players are required per team and the game usually involves more maneuvering and shorter plays at lower speeds due to space limitations of the arena. Arena polo is played with a small air-filled ball, similar to a small soccer ball. The modern game lasts roughly two hours and is divided into periods called chukkers.
Polo saddles are English-style, but have developed over the years into saddles unique to polo. A breastplate is added, usually attached to the front billet. A standing martingale may be used: if so, a breastplate is a necessity for safety. The tie-down is usually supported by a neck strap. Many saddles also have an overgirth. The stirrup irons are heavier than most, and the stirrup leathers are wider and thicker, for added safety when the player stands in the stirrups. The legs of the pony are wrapped with polo wraps from below the knee to the fetlock to prevent injury. Jumping (open front) or gallop boots are sometimes used along with the polo wraps for added protection. Polo is ridden with double reins for greater accuracy of signals. The bit is frequently a gag bit or Pelham bit. In both cases, the gag or shank rein will be the bottom rein in the rider's hands, while the snaffle rein will be the top rein. If a gag bit is used, there will be a drop noseband in addition to the cavesson, supporting the tie-down. One of the rein sets may alternately be draw reins.