Madrid Big Buckle CognacMadrid Big Buckle Oiled Leather Cognac Fit Notes The Birkenstock Madrid Big Buckle Oiled Leather Sandal runs true to size with Birkenstocks signature contoured footbed that gradually shapes to your foot. The single adjustable strap lets you customize the fit, while the supportive cork latex base offers stability despite the sleek one strap design. Expect a short break in period as the footbed softens and forms to your natural step. Styling Notes