T-Mobile Park, Baseball stadium in SoDo district, Seattle, US.

T-Mobile Park is a baseball stadium in the SoDo district south of downtown Seattle, with a retractable roof made of steel and fabric. The roof covers most of the seating and leaves the right outfield open to allow views of the nearby downtown skyline.

The facility opened in July 1999 after Washington State approved funding to keep the Mariners in town. Construction followed a public vote and replaced an older domed venue that was poorly suited for baseball.

The center-field concourse is called The Pen and opens two hours before the rest of the gates. The stadium's retractable roof, stored above the right-field stands, is made of three steel panels weighing about 11,000 tons and takes roughly 20 minutes to open or close. Because the ballpark was built beside a freight rail line, passing trains echo off the roof and can be heard inside.

The stadium is reachable by several bus routes, commuter rail, and light rail that all stop within walking distance. On game days, gates typically open a few hours before the first pitch, giving time to visit exhibits and concessions.

The retractable roof sits above the right-field stands and is made of three steel panels weighing about 11,000 tons; opening or closing takes roughly 20 minutes. Because the ballpark was built beside a freight rail line, passing trains echo off the roof and can be heard inside the stadium.