In the sport of polo, players use a unique type of equipment called a mallet to hit a ball while riding horses. The polo mallet has a long handle made of cane or wood, topped with a wooden head, allowing players to hit the ball from various angles while mounted. Additionally, players wear protective gear like helmets, knee pads, and leg guards to ensure safety during the fast-paced game. The combination of horse riding skill and coordination with the mallet is crucial for success in polo.