Originally purchased directly from Birkenstock. Ultra Blue color appears to be no longer available. Like new. Size 42, L 11, M9 “Light-as-air and designed to go with the flow. The Barbados slide is made from water-friendly material, giving you a flexible design built on the contoured footbed you love most. The perfect throw-and-go style for everything from the pool to post-workout. Contoured footbed for legendary BIRKENSTOCK® support Made from one piece of molded EVA Water-friendly, lightweight & flexible Made in Germany”