This is an official away or third kit soccer jersey for Athletic Club Bilbao, manufactured by Castore. The shirt features a sleek black base with an intricate geometric pattern of diagonal lines and dot matrices in varying shades of gray, creating a modern, high-tech aesthetic. Prominently displayed across the chest is the main sponsor 'Kutxabank' in bold white lettering with black outline. The Athletic Club crest—featuring red and white vertical stripes with a green border and Basque motto—is positioned on the left chest, while the Castore brand logo (a stylized winged 'V') appears on the right chest. The collar interior bears the Castore tag, and both sleeves feature official La Liga patches: the left sleeve shows the red-and-white La Liga logo, and the right sleeve displays the 'B' patch indicating participation in the Spanish top flight. Made from lightweight, breathable performance fabric with moisture-wicking properties, this jersey ensures optimal comfort during training or match play. Ideal for fans, collectors, or active wearers seeking authentic club apparel with contemporary sportswear design. Suitable for casual streetwear styling when paired with jeans or joggers, reflecting the growing trend of football kits as fashion statements.