The BIRKENSTOCK Boston clog is a veritable classic that can easily be worn all year round. The upper is made from the skin-friendly, hard-wearing synthetic material Birko-Flor®. This version of the sandal is tone-on-tone, giving it a trendy camouflage look. It could almost be mistaken for real leather. The color-coordinated buckles with a textile feel and a matte design are additional eye-catchers. Anatomically shaped cork-latex footbed Birko-Flor® is a skin-friendly, tear-resistant and easy-care synthetic material which is used exclusively by BIRKENSTOCK. BIRKO-FLOR® Birko-Flor® is a skin-friendly, tear-resistant and easy-care synthetic material which is used exclusively by BIRKENSTOCK.