This authentic Athletic Club Bilbao home jersey for the 2023–24 season features the club’s iconic red-and-white vertical stripes with subtle geometric texture printing on both stripe colors for depth and modern performance aesthetics. Manufactured by Castore, the official technical partner, it showcases a clean crew neck with black inner collar tape labeled 'CASTORE', a left-chest embroidered club crest (featuring the shield with green mountain, red-and-white stripes, and 'ATHLETIC CLUB BILBAO' text), and the main sponsor 'Kutxabank' in bold black lettering across the chest. The right sleeve bears the LaLiga 'B2' patch (indicating Segunda División or reserve team designation), while the left sleeve displays the Castore eagle logo. A small Castore woven label is positioned at the lower-left hem. Constructed from lightweight, moisture-wicking polyester fabric with strategic ventilation zones, this jersey offers excellent breathability and comfort during training or match days. Ideal for fans and players alike, it blends heritage identity with contemporary sportswear engineering—perfect for matchday support, casual streetwear styling, or light athletic activity. The design honors Bilbao’s traditional colors while embracing modern technical standards, making it a versatile piece for daily wear or gameday pride.