In the NBA London Game 2018, the Boston Celtics faced off against the Philadelphia 76ers. Kyrie Irving, a key player for the Celtics, sported a unique version of his signature shoe, the Kyrie 4 PE, inspired by the city of London. With a colorway featuring purple and yellow, the design pays homage to the emblem of the Royal Philharmonic Orchestra, while the red pattern on the sneaker represents a violin hole. This exclusive shoe was limited to the European market and made its debut in January 2018 at selected retailers.