Sheec is a trademarked private brand that is designed by D'aht World in New York, USA (fashion capital of the world). Size variation is based on US shoe sizes. Sheec SlingBack is a light sock option that simply covers your toes and the ball of your feet for comfort without the bulk. Premium quality cotton will keep your feet dry and clean. Premium Cotton, Spandex and Polyester. How to care: Delicate Cycle Wash & Air-Dry.