The term goal may also refer to the structure in which goals are scored. The ice hockey goal is rectangular in shape; the front frame of the goal is made of steel tube painted red (blue in the ECHL because of a sponsorship deal with GEICO) and consists of two vertical goalposts and a horizontal crossbar. A net is attached to the back of the frame to catch pucks that enter the goal and also to prevent pucks from entering it from behind. The entire goal is considered an inbounds area of the playing surface, and it is legal to play the puck behind the goal. Under NHL rules, the opening of the goal is wide by tall, and the footprint of the goal is deep.