The colour is undoubtedly associated with the San Fermin fiesta. The participants in the Encierro traditionally wear small pieces of cloth around their necks and waists during the bull-run. The scarfs are called pañuelos, and the waistbands – fajas.
Besides that, people in Pamplona are passionate about sports. And as you might except for a Spanish city, football is the game enjoying the greatest affection among local community. They support Club Atletico Osasuna, the only team that has ever played in the top flight. People love “rojillos,” or “the Reds” and cheer for the team at the “El Sadar” stadium every fortnight.
CA Osasuna is one of the four Spanish clubs entirely owned by its fans (socios) next to Real Madrid, Barcelona, and Athletic Bilbao. What is even more remarkable is the fact that practically 10 percent of the population owns a share of the club. The stadium’s capacity is almost sold out to season ticket holders. Osasuna is a Basque word translated as health or strength.
So, wearing red will make you look like a local guy. It does not necessarily mean to put on an Osasuna kit, but if you show in it on the streets, you will meet more smiley faces around.