MADRID BIG BUCKLE by BIRKENSTOCK is a freshen up of the iconic single strap slip-on MADRID with an amplified metal pin buckle. MADRID BIG BUCKLE features a leather upper, an EVA traction pattern sole and a Semi-Exquisite footbed that will support your feet and guide them into a natural position with the anatomically moulded design that is leather lined. As the upper of this style is made from natural leather, there may be variations in the colour of the leather.