passivity on the part of a wrestler; thus, it is also known as the passivity zone. Inside the red zone is the central wrestling area which is seven meters in diameter. In the middle of the central surface of wrestling is the central circle, which is one meter in diameter. The central circle is surrounded by a band 10 centimeters (4 in) wide and is divided in half by a red line eight centimeters (3 in) in width. The diagonally opposite corners of the mat are marked with the wrestlers' colors, red and blue or in some areas, Red and Green. For competition in the Olympic Games, the World Championships, and the Continental Championships, the mat is installed on a platform no greater than in height. If the mat lies on a podium and the protection margin (covering and free space around the mat) does not reach two meters (6 ft 6 in), the sides of the podium are covered with 45° (degree) inclined panels. In all cases, the color of the protection area is different from the color of the mat. Equipment A singlet is a one-piece wrestling garment made of spandex that should provide a tight and comfortable fit for the wrestler. It is made from nylon or lycra and prevents an opponent from using anything on the wrestler as leverage. One wrestler usually competes in a red singlet and the other in a blue singlet. A special pair of shoes is worn by the wrestler to increase their mobility and flexibility. Wrestling shoes are light and flexible in order to provide maximum comfort and movement. Usually made with rubber soles, they help give the wrestler's feet a better grip on the mat. A handkerchief, also called a bloodrag, is carried in the singlet. In the event of bleeding, the wrestler will remove the cloth from his singlet and attempt to stop the bleeding or clean up any bodily fluids that may have gotten onto the mat. Headgear, equipment worn around the ears to protect the wrestler, is optional in freestyle. Headgear is omitted at the participant's own risk, as there is the potential to develop cauliflower ear. The match A match is a competition between two individual wrestlers of the same weight class. In freestyle wrestling, a jury (or team) of three officials (referees) is used. The referee controls the action in the center, blowing the whistle