This is a Birkenstock Tokio. Size 41. It's a model with a heel strap added to the very popular Boston. - Brand: BIRKENSTOCK - Size: 41 (approx. 26.5cm) - Color: Black - Style: Clog Sandals This model is made of black suede and is easy to match with any style. It has a narrow fit for a sleek silhouette. It might be perfect for those who find the Boston to be too loose. Thank you for looking.