When standing-room areas do exist, they are generally not sold separately from seats, but rather are provided for spectators who wish to view a portion of the game from a different angle (such as the bullpen area and centerfield terrace at Seattle's Safeco Field), or are admission-free (such as an area at San Francisco's AT&T Park, where the game is visible from a public waterfront walk, through a series of fenced archways which form a part of the outfield wall). Notable exceptions to this are the NFL Washington Football Team's FedExField, which contains a terrace-style standing room only section in the higher areas above each end zone, and the Dallas Cowboys, who sell standing-room tickets for 4 large endzone terraces and smaller terraces located in the corners of AT&T Stadium. The Boston Red Sox baseball team offers standing room tickets when a game is sold out. The Detroit Red Wings and Detroit Tigers both offer standing room only seating. There are no major standing room terraces; rather, people stand along the edges of the concourses directly at the back of the seating areas.