The upper of this unisex two-strap sandal can be individually adjusted to the wearer’s feet using two sturdy metal buckles – guaranteeing a good fit and firm support. Every pair of Birkenstocks is made from the highest quality materials. The Vegan footbed is the classic Birkenstock cork footbed with a Microfibre lining. Birko-Flor Upper / Vegan Footbed - Microfibre Lined Birko-Flor is the Birkenstock trade marked synthetic leather. It is a skin friendly, easy care fabric. Clean with a damp cloth.