Birkenstock Women's Florida Soft Footbed Birko-Flor  Blue Sandals - 38 N EU Synthetic Imported Synthetic sole Birkenstock Women's Florida Birko-Flor Sandals. Footbed: The original Birkenstock footbed - Featuring pronounced arch support, deep heel cup, and roomy toe box. Footbed molds and shapes to your foot. Upper material: Birko-Flor is a skin-friendly, tear-proof and easy-care material. The upper layer of the material has a structure similar to leather. The underside is made of a soft fleece. Sole material: EVA - Flexible, lightweight, durable and shock absorbing. Made in Germany by Birkenstock.