prefer to use a single length of mallet regardless of the height of the horse. Either way, playing horses of differing heights requires some adjustment by the rider. Variable lengths of the mallet typically range from to . The term mallet is used exclusively in US English; British English prefers the term polo stick. The ball is struck with the broad sides of the mallet head rather than its round and flat tips. Saddle Polo saddles are English-style, close contact, similar to jumping saddles; although most polo saddles lack a flap under the billets. Some players will not use a saddle blanket. The saddle has a flat seat and no knee support; the rider adopting a forward-leaning seat and closed knees dissimilar to a classical dressage seat. A breastplate is added, usually attached to the front billet. A standing martingale must be used: 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 minimize pain. Jumping (open front) or gallop boots are sometimes used along with the polo wraps for added protection. Often, these wraps match the team colours. The pony's mane is most often roached (hogged), and its tail is docked or braided so that it will not snag the rider's mallet. 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. The field The playing field is , the area of approximately six soccer fields or nine American football fields (10 acres), while arena polo is 96 x 46 metres. The playing field is carefully maintained with closely mowed turf providing a safe, fast playing surface. Goals are posts which are set eight yards apart, centred at each end of the field. The surface of