Betula Licensed by Birkenstock Boogie BF Soft (Unisex) Sandal Medium Upper: Birko-Flor; Insole: Leather; Footbed: Natural Cork Classically styled wide two-strap sandal with adjustable buckles Synthetic Birko-Flor upper has a smooth leather-like finish, yet is durable and easy to care for Footbed features toe grip, deep heel cup and contours for orthopedic support that improves alignment Footbed made of natural cork with a suede liner that adapts to your foot's shape Soft footbed features an added foam layer that cushions feet with excellent shock absorption