Athletic Club and Castore have introduced their new Fourth Kit for the 2025/26 season, created in a red and black colourway that incorporates graphic elements inspired by the club’s lion symbol.
The Athletic Bilbao football shirt features a full body graphic constructed from horizontal black lines set against a red base, forming a stylised lion motif that becomes clearer when viewed from distance. A black crewneck sits at the top of the shirt, with the sleeves carrying the same patterned layout. The club crest appears on the left chest in a tonal red and black application, while Castore branding is positioned on the right side.
Sponsor logos are applied across the front, sleeve and lower back areas. The reverse of the jersey continues the lion inspired graphic, with a smaller version of the motif placed at the upper back.
The kit is completed with black playing shorts and black socks. Castore’s Aertek fabric is used throughout the jersey construction, providing a lightweight performance material intended for match use throughout the 25/26 season.
View the: Athletic Bilbao 25/26 Home Kit
View the: Athletic Bilbao 25/26 Away Kit
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