Authentic Athletic Bilbao home jersey for the 2023–24 season, manufactured by Castore. Features bold vertical red-and-white stripes—a signature design of the Basque club—paired with a black contrast collar and sleeve trim for modern sporty refinement. The chest displays the official Athletic Club crest on the left and the main sponsor 'Kutxabank' in stylized black lettering across the center. A small Castore logo (butterfly emblem) appears on the right chest. Made from lightweight, breathable performance fabric with moisture-wicking properties, this short-sleeve polo-style jersey ensures comfort during matches or casual wear. Ideal for fans attending games, tailgating, or everyday streetwear styling with jeans or shorts. The tailored fit and professional finish reflect Castore’s reputation for high-performance football apparel. Perfect for summer and spring due to its ventilation and quick-dry technology.