The durable and of course flexible sole is made of shock-absorbing EVA. The Birkenstock Women’s Arizona BF SFB Sandals are a two-strap classic with adjustable straps and a magical cork footbed that conforms to the shape of your foot. The sandals are made with durable, synthetic upper material with a nubuck leather-like texture and a soft backing, and feature pronounced transverse arch support, heel mould and roomy toe grip. The interior and exterior of the sandals feature longitudinal arch support, and the sandals have a lightweight EVA sole for cushioning and shock absorption.