Athletic Bilbao B, known as Bilbao Athletic, is the reserve team of Athletic Club, based in Bilbao in the Basque Country. They compete in the Primera División RFEF, Spain's third tier, and play at the Lezama Facilities, the club's renowned training ground. Founded to develop players for the unique first team, which fields only Basque players, Bilbao Athletic is crucial to the club's philosophy. The team wears the same red and white stripes as the senior side. Formed in 1964, its early history was dedicated to refining the Lezama production line. Its peak eras are intrinsically linked to the first team's success, as it produces a steady stream of talents like Aymeric Laporte and Unai Simón who become stars at San Mamés. In the current Primera RFEF, Bilbao Athletic is a competitive side focused exclusively on developing players within the Basque player pool, playing a high-intensity, technical style. The culture is one of immense pride and pressure, as every player carries the hope of becoming a first-team legend, watched closely by a fan base that values homegrown talent above all.