Athletic Bilbao and Castore have collaboratively launched the 2025-26 third kit—a visually striking uniform in turquoise green that pays homage to the club’s worldwide supporter network. Blending contemporary performance fabrics with emblematic symbolism, this kit not only enhances visibility on and off the pitch but also celebrates the unifying bond that links Bilbao to fans around the globe.
Design and Technical Features
The 2025-26 third kit makes a striking visual impact with its turquoise green colorway—a refreshing departure from traditional hues—paired with sleek black accents on the collar and sleeve cuffs. This contrast provides a clean, modern finish that enhances the shirt’s contemporary appeal.
Crafted using Castore’s advanced AerTek performance fabric, the kit is engineered to deliver maximum comfort in high-pressure match environments. The material ensures excellent breathability, moisture management, and lightweight durability—qualities essential for players competing in both domestic and European fixtures. Turquoise shorts and socks complete the ensemble, creating a cohesive and dynamic look that aligns with modern football design trends.
History and Inspiration
The use of green in Athletic Club’s kits is steeped in history, having been a recurring feature in alternative designs for over fifteen years. Fans will recall moments of triumph in previous green kits, including significant goals and historic victories that have become part of the club’s folklore. With Castore now bringing its own design philosophy to this tradition, the color returns in a fresh, reimagined style.
At the heart of the shirt lies its most distinctive element: a subtle, all-over pattern of interlocked crests. Each crest represents one of the club’s 467 official supporters’ clubs, spread across different continents but united by their loyalty to the red-and-white stripes. This intricate design is a visual celebration of Athletic’s enduring connection to its global fan base—a reminder that the club’s identity extends beyond Bilbao to football communities around the world.
Usage and Debut
The third kit was officially unveiled in July 2025, marking the latest chapter in the club’s partnership with Castore. While its on-pitch debut is anticipated in upcoming fixtures of the 2025-26 season, the design ensures it will stand out wherever Athletic plays—whether under the lights of San Mamés or during away matches in European competitions.
This is the first time Castore has introduced green into Athletic’s range since taking over as technical supplier, demonstrating a willingness to blend tradition with modern design. The launch campaign emphasized the theme of unity, reflecting the idea that the club’s identity is built on the support of its community, both local and global.
Did You Know?
- The shirt’s interlocked crest motif isn’t just decorative—it contains exactly 467 crests, representing each official Athletic supporters’ club around the world.
- Green has been a familiar feature of Athletic’s alternate kits for more than 15 years, becoming associated with memorable matches and historic moments.
