“The sash (faixa) is the most important part of their outfit, since it supports the lower back and is used by other castellers in the team as a foothold or handhold when climbing up the tower.
This tasselled piece of cloth varies in length and width and depends on the casteller’s position inside the tower and also on choice. The length of the sash ranges from 1.5 to 12 m and usually is shorter for those higher up in the castell.
Performing castellers usually go barefoot as to minimise injuries upon each other as they climb to their positions and also for sensitivity when balancing and to have better feel and hold each other. ” (Wikipedia)