The 2026-27 Athletic Bilbao Away Shirt features a powerful, predominantly black base color that serves as a dark canvas for its detailed accents. The design is complemented by vibrant red and crisp white piping on the classic crew-neck collar and sleeve cuffs, creating a sharp contrast. A small red, white, and green Ikurriña motif is elegantly placed on the back of the neck, representing the deep generational connection and Basque pride of the club. Expertly crafted by Castore, this high-performance shirt combines a modern aesthetic with the traditional soul of the Lions.