A legendary, veritable classic, the Birkenstock Women's Boston Essential EVA Sandal can be worn comfortably all year round. Thanks to its sophisticated, individual design, the Boston is modeled on the cork sandal and made from the ultra lightweight and highly flexible synthetic EVA material. Pre-tested for harmful substances, the EVA is high-quality, odor-neutral and combines various positive attributes with its highly elastic, shock-absorbent, waterproof and skin-friendly traits.