David Otero visited the island of Phi Phi (Thailand) in March 2005, where he saw the damage caused by the 2004 Indian Ocean earthquake and tsunami. Along with other artists he decided to found an organisation called "Kuarkx" with the objective of collecting money for those affected by the disaster. Otero, with the help of his cousin Dani, wrote the song "Despiértame" (Wake me up!) and made it available over the Internet where it could be downloaded for 1.15 euros. When El Canto del Loco were recording their new album they decided to include the song and dedicate a proportion of the album's profits to the same cause. Their new album, which was called Zapatillas (Sneakers), was released on 21 June.