The roar of lions is much more than a sound. It's a feeling, an emotion that gets under your skin. That's what the fourth kit stands for, much more than just a shirt.

When that roar is heard, it resonates far beyond San Mamés. Not only do the 11 players roar on the pitch, but also the entire fans. The Athletic family learns to roar, it's something that is inherited. The roar is felt. It is worn.