From Birkenstock, the Women's Boston Big Buckle Nubuck Tonal Footbed Clogs feature: Premium nubuck leather upper Adjustable strap with oversized big buckle design Slip on design Tonal suede footbed lining helps keep you comfortable Deep heel cup supports the foot and holds the heel firmly in its natural position Contoured cork-latex footbed creates custom support with wear Flexible and lightweight EVA outsole Imported. Sizing Notes: Birkenstock footwear is made in European whole sizes. The style selected is a Birkenstock narrow footbed that will fit most medium feet.