The 2026-27 Athletic Bilbao Home Shirt features the club's traditional red and white vertical stripes, with exactly seven red stripes representing the seven provinces of the Basque Country. The design includes a black V-neck collar with a narrow white trim, black shoulder inserts, and black sleeve cuffs. A detailed map of the Basque Country and the Ikurriña flag are positioned on the upper back, while the red stripes contain a fine tonal line pattern.