This is the official 2023–24 away jersey of Athletic Club Bilbao, manufactured by Castore. The vibrant yellow short-sleeve jersey features a clean, modern design with white trim on the crew neck and sleeve cuffs. Prominently displayed across the chest is the main sponsor 'Kutxabank' in bold black lettering with white outline, while the club’s iconic shield crest—featuring red-and-white vertical stripes, green laurel branches, and the text 'Athletic Club Bilbao'—sits above it. The Castore brand logo (a stylized winged 'V') appears on the left chest, and a small Castore authenticity tag is sewn at the lower left hem. Sleeve patches include the LaLiga Santander logo (left sleeve) and the B2P (Bilbao 2023–24) commemorative patch (right sleeve). Made from lightweight, breathable performance fabric with moisture-wicking properties, this jersey ensures comfort during matches or casual wear. Ideal for fans supporting the Basque club, it blends sport functionality with streetwear appeal—perfect for matchdays, training sessions, or everyday casual styling in warm seasons.