The 2026/27 Athletic Bilbao Third Jersey introduces a fresh sky-blue look inspired by the iconic architecture of San Mamés.

Designed by Castore, the third shirt features a predominantly sky-blue colour with pairs of diagonal and horizontal white lines inspired by the exterior cladding and roof slats of San Mamés stadium. The design celebrates Athletic Club's supporters under the message “Always With You”.

Athletic Bilbao Third Jersey 2026/27

The Athletic Bilbao Third Jersey 2026/27 features a striking sky-blue base.

Across the shirt are pairs of white diagonal and horizontal lines that reproduce the visual rhythm of the architectural slats surrounding San Mamés.

The result is a clean, modern and highly distinctive third kit for the 2026/27 season.

Castore Athletic Bilbao Third Jersey

The 2026/27 Athletic Bilbao third shirt is produced by Castore, Athletic Club's technical partner.

Athletic Club officially announced the new third kit in July 2026, confirming that Castore designed the shirt for the new 2026/27 campaign.

The official Athletic Club store also lists the men's third short-sleeve shirt as part of the 26/27 collection and confirms the colour as Light Blue.

Athletic Bilbao Sky Blue Jersey

Sky blue is the defining colour of the 2026/27 Athletic Bilbao Third Jersey.

The colour represents the symbolic sky surrounding San Mamés, creating the visual concept of the stadium existing within a limitless sky.

This gives the third shirt a completely different appearance from Athletic's traditional red-and-white home colours.

San Mamés Inspired Jersey

The central design concept is San Mamés Without Limits.

The white lines across the sky-blue background are inspired by the slats of the exterior roof structure of San Mamés.

The architectural reference turns the stadium into an integral part of the jersey design.

Athletic Club Always With You Jersey

The 2026/27 third kit carries the message “Always With You”, reflecting the strong relationship between Athletic Club and its supporters.

The club explains that wherever the Lions play, the red-and-white Athletic supporters represented by San Mamés are always alongside the team, without limits or borders.

The concept makes the jersey more than simply an alternative match shirt—it represents the Athleticzale family and its connection with the club.

Athletic Bilbao AerTek Football Shirt

The third jersey is made with AerTek fabric, a technical material selected for the 2026/27 Athletic Club collection.

The lightweight technical construction is designed for football performance while maintaining a comfortable feel for supporters.

The official Athletic Club store confirms that the main third kit shirt uses AerTek fabric.

Athletic Bilbao Light Blue Third Kit

The 2026/27 third kit is built around a light blue and white colour combination.

The light blue shirt is accompanied by matching third-kit shorts and socks, creating a complete alternative matchday look. The official club store lists the third shorts and socks in Light Blue.

2026/27 Athletic Bilbao Third Jersey Features

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Why Choose the 2026/27 Athletic Bilbao Third Jersey?

Castore Athletic Bilbao Design

The 2026/27 Athletic Bilbao Third Jersey is designed by Castore, Athletic Club's official technical partner.

Sky Blue Colour

The shirt uses a distinctive sky-blue base inspired by the sky seen from inside San Mamés.

White Architectural Lines

Pairs of diagonal and horizontal white lines mimic the exterior slats of San Mamés stadium.

San Mamés Inspiration

The entire design is built around the concept of San Mamés Without Limits, turning the stadium's architecture into the shirt's visual identity.

Always With You

The kit celebrates Athletic Club supporters with the message “Always With You”, highlighting the connection between the team and the Athleticzale family.

AerTek Fabric

The third shirt is made from AerTek fabric, providing a technical construction suitable for football and everyday wear.

Official 2026/27 Third Kit

The Athletic Club official store lists the third shirt as part of the club's 2026/27 collection.

Perfect For

• Athletic Bilbao supporters
• Athletic Club fans
• Athleticzale supporters
• Bilbao football fans
• Basque football fans
• LaLiga supporters
• Castore football shirt collectors
• Athletic Bilbao jersey collectors
• Football shirt collectors
• San Mamés fans
• Stadium enthusiasts
• Matchdays
• Stadium wear
• Football streetwear
• Casual everyday wear
• Supporter gifts

Frequently Asked Questions

1. What is the Athletic Bilbao Third Jersey 2026/27?

It is the official Athletic Club third football jersey for the 2026/27 season.

2. Who makes the Athletic Bilbao 2026/27 Third Jersey?

The jersey is made by Castore. Athletic Club officially confirmed that the new third kit was designed by Castore.

3. What colour is the Athletic Bilbao Third Jersey?

The main colour is sky blue / light blue, officially listed by the Athletic Club store as Light Blue.

4. What is the design of the Athletic Bilbao Third Jersey?

The shirt features pairs of diagonal and horizontal white lines inspired by the exterior slats of San Mamés stadium.

5. What inspired the 2026/27 Athletic Bilbao Third Jersey?

The design is inspired by San Mamés, particularly the architectural slats of the stadium's exterior and roof.

6. What does “Always With You” mean?

The phrase represents Athletic Club's supporters and their commitment to remaining alongside the team wherever the Lions play.

7. What fabric does the Athletic Bilbao Third Jersey use?

The shirt is made using AerTek fabric, according to the official Athletic Club store.

8. Is this the Athletic Bilbao Away Jersey?

No. This product is the Athletic Bilbao Third Jersey 2026/27. The official 2026/27 away kit is a separate black shirt with red shorts and socks.

2026/27 Athletic Bilbao Third Jersey

The 2026/27 Athletic Bilbao Third Jersey combines a fresh sky-blue colour with distinctive white architectural lines inspired by San Mamés.

Designed by Castore, the shirt celebrates the Athletic Club supporters through the “Always With You” concept while using AerTek fabric for a modern technical football-shirt construction.

It is an excellent choice for Athletic Bilbao supporters, Athleticzale fans, LaLiga followers, San Mamés enthusiasts and Castore football-shirt collectors.