Real Sociedad B, known as Sanse, is the reserve team of La Liga's Real Sociedad. Based in San Sebastián, the team holds the unique distinction of competing in the Spanish Segunda División, the country's second tier, a rare achievement for a B team. They play their home games at the state-of-the-art Zubieta training facility. Sanse is the crown jewel of Real Sociedad's famed youth system, which operates under a philosophy of developing local Basque players. The team's promotion to the second division in 2021 was a historic feat, showcasing the incredible depth of talent at the club. It serves as the final proving ground for prospects before they join the first team, with graduates including world-class stars like Mikel Oyarzabal, Martín Zubimendi, and Robin Le Normand. Competing against full-professional sides, Sanse provides an unparalleled level of competitive education. While independent fan support is modest, their success is a huge source of pride for the club. Real Sociedad B is not just a reserve team; it is a testament to one of Europe's most productive academies.