Birkenstock Adria Henna Oiled Leather $110 Just a little bit of leather goes a long way to comfort in this streamlined toe piece sandal. The strap placement sweeping back on the sides provides a secure fit and you can adjust the buckles to your feet. Soft leather toepiece. Classic Birkenstock cork footbed has great arch support and a deep heel cup to keep you stable while walking. Lightweight and durable EVA soles can be replaced when worn.