This is the official 2023–24 third match jersey of Athletic Club Bilbao, manufactured by Castore. The jersey features a striking light blue base with an intricate all-over geometric lion head pattern—a tribute to the club’s iconic 'Lions of San Mamés' nickname—rendered in tonal shades for subtle depth and texture. The V-neck collar and sleeve cuffs are trimmed in navy blue, enhancing contrast and sporty elegance. Prominently displayed across the chest is the main sponsor 'Kutxabank' in bold black-and-white typography, while the Castore logo (winged emblem) sits on the left chest and the Athletic Club crest on the right. Sleeve patches include LaLiga branding on the right arm and the Basque Country 'B' flag patch on the left, signifying regional identity. Made from lightweight, breathable performance fabric with moisture-wicking technology, it ensures optimal comfort during matches or casual wear. Ideal for fans seeking authentic club apparel with modern design aesthetics, this jersey blends heritage symbolism with contemporary sportswear engineering. Perfect for matchdays, streetwear layering, or gameday gatherings.