The BIRKENSTOCK Boston clog is a timeless favorite, perfect for year-round wear. Its dual-component sole enhances both stability and comfort, featuring a cushioned EVA midsole and a slip-resistant rubber outsole. The upper is crafted from premium, soft natural leather. Ergonomically designed cork-latex footbed Upper: natural leather Footbed lining: suede Sole: slip-resistant rubber-EVA sole Details: single strap with an adjustable metal pin buckle; dual-component sole of EVA and rubber “Made in Germany” Upper material: Natural leather Insole: Natural leather Natural leather is identifiable by its unprocessed surface. BIRKENSTOCK intentionally leaves surface grains and other natural features intact. The upper material is made from robust leather with a thickness of 2.8 to 3.2 millimeters. Footbed material: Cork Cork is an eco-friendly material sourced from the bark of the cork oak tree. This natural substance provides excellent insulation and cushioning. Outsole: Super-grip The super-grip sole consists of two parts: a non-slip, oil- and grease-resistant rubber outsole and a shock-absorbing EVA midsole.