Women's Florida Sandal in Mocha by BirkenstockTriple Adjustable Straps Upper material: Birkibuc Made of acrylic and polyamide felt fibers, this material offers a textured finish that looks and feels like velvety nubuck. Footbed: Soft footbed A foam layer is inserted between the cork layer and the suede liner of the original Birkenstock footbed. Millions of microscopic air bubbles cushion your feet Sole material: EVA Flexible, Lightweight, Durable and Shock Absorbing.