Birkenstock - Star (Green Vinyl) - Women's: The Limited Edition 'Star' sandals are styled by Heidi Klum(R) exclusively for Birkenstock(R). The uppers are made of colored vinyl with metallic accents. The raised toe bar with cute 'Star' detail is designed to encourage the natural gripping motion of your feet, exercise your legs and improve circulation. The footbed liner curves to ensure even weight distribution and proper arch support. Neutral heel cup keeps the foot's natural padding directly under the heel as nature intended. Outsole is flexible, durable, lightweight, shock resistant and replaceable.