BIRKENSTOCK. 1021101. BUCKLEY SHEARLING. MOUNTAIN GREEN. The BIRKENSTOCK Buckley is a semi-open moccasin-style clog that s instantly recognizable as an authentic BIRKENSTOCK original thanks to its exposed cork footbed. Here the classic model comes in a particularly cozy version with genuine shearling and a statement buckle. The perfect shoe for chilly evenings The upper is made from soft suede leather.