Arena Football is always played indoors, normally in arenas made for basketball or hockey teams. The field is the same width (85 feet) and length (200 feet) as an NHL Hockey arena. The endzones are eight yards deep and are sometimes rectangular like a basketball court or curved like a hockey arena. Around the sideline is a thick padding used to prevent injuries while getting tackled into the wall.
The goalpost uprights are nine feet wide and the crossbar is fifteen feet above the field turf. The ball is actually still considered a "live" ball if it bounces off of the crossbar, uprights, or back net. Also, unlike the NFL or College, a player is not considered out of bounds unless they are tackled into the sidelines.