Official AC Siena tracksuit from the 2011/2012 season, produced by technical sponsor Kappa. The design features the classic black color with white inserts along the sleeves, enhanced by Kappa's signature logo band on the sides. The chest displays the large "AC Siena" lettering, along with the club's crest featuring the famous prancing horse, a symbol of the city of Siena. The pants mirror the same motif, with the club crest repeated on the left leg. The tracksuit is lightweight, ideal for training sessions and team travel.

During the 2011/2012 season, Siena, coached by Giuseppe Sannino, competed in Serie A, securing a comfortable mid-table finish. The team showcased strong defensive performances, with goalkeeper Gianluca Pegolo and defender Massimo Paci standing out as key players.