"It's got an in-field system in it which is sand and rubber," NFL field director Ed Mangan said.
Crews hard at work preparing stadium for Super Bowl →
"We don't want to be a hindrance to the game or stop the game, but it's going to be hard to see the game on the field with no yard lines," he said. "We don't want to interrupt the flow of the game, but the field needs to be playable."
NFL's turf gurus gird for historic Super Bowl →