In June 2001, Kentucky Bluegrass was laid on the field, at half the height of most NFL field's grass. The field is heated from below, using a mixture of antifreeze and hot water, to keep the field at around 62 °F (17 °C) in order to keep the grass growing year-round. The field was re-surfaced multiple times, until the synthetic-enhanced Desso GrassMaster was installed in 2003. Debate continued over the surface after players began slipping during game play. Despite this players and coaches of Pitt, the Steelers, and their opponents supported keeping the current turf.