Judo takes places on vinyl-covered foam mats called tatami covering an area of 14m square. This area is split into three specific areas, the inner contest area which is bounded by a one-metre red area, which alerts judoka that they are nearly out of bounds and finally the outside zone, which is three metres wide. That area is classed out of bounds.
Two pieces of tape, one blue and one white, appear on the middle of the contest area. These are four metres apart and mark where the opponents stand to begin and end a bout.
Loose fitting uniforms called judogi are worn for the contest. These consist of pants, a jacket and a belt tied at the waist. All competitors will wear a black belt to signify their dan grades.