Rare! Attendee gift. Plastic only. Not a regulation hard hat. This hat was from the actual demolition ceremony. From Wikipedia: In June 2005, the university Board of Trustees authorized plans for the stadium's demolition and reconstruction that would remove the track, reduce the stadium capacity, and bring it up to date with present standards for sporting venues. Various justifications for the renovation included poor sightlines in the existing stadium (rendering the bottom 14 rows unusable), long stairways, and lack of adequate restroom facilities. The track around the stadium had previously created a large distance between the field and the spectators. Construction began minutes after the Cardinal's last home game of the 2005 football season, a 38–31 loss to Notre Dame on November 26. Bulldozers began tearing out the natural field turf in a ceremony held while attendees were still in the stadium for the game.