Birkenstock Boston mules combine a seamless oiled nubuck upper with an anatomical cork-latex footbed for reliable everyday comfort. Product image is indicative. Key attributes: Gray | Grey taupe | Nubuck leather | Anatomical cork-latex footbed | EVA sole | Adjustable strap with metal buckle | Seamless upper | Closed-toe mule silhouette | Classic Boston design | Composition & care: Upper: oiled nubuck leather | Footbed: cork and latex | Insole: suede leather | Outsole: EVA