The Boston clog features a pony-like fur upper and an exclusive 1774 buckle. This design combines distinctive texture with modern craftsmanship. pony-like fur upper nappa leather lining 1774 buckles anatomically shaped cork-latex footbed tonal nappa leather covering black EVA outsole gold 1774 branding in the heel cup Birkenstock embossing on medial side 1774 box dustbag