Three adjustable straps made from soft Birkibuc synthetic nubuck perfect the fit of a casual sandal fitted with Birkenstock's legendary footbed that mimics the shape of your foot and provides excellent arch support. Color(s): mocha. Brand: BIRKENSTOCK. Style Name: Birkenstock 'Florida Birkibuc' Soft Footbed Sandal (Women). Style Number: 814319 1.