Three Rivers Stadium, once home to the Pirates and Steelers. This stadium hosted the first World Series game played at night in '71 and then the following year was the site of the Immaculate Reception. Timeless and versatile, our tri-blend tee will quickly become your favorite tee. Made from a cotton and polyester blend, with a touch of rayon. Lightweight, breathable and has a subtle texture to give it an authentic vintage look. It's pre-laundered for an extremely soft feel, and it may shrink a bit on the first wash and dry.