Features of the Vivobarefoot Asana Yin Ballerina Leather model: Design: Classic ballet flats with a modern design suitable for both everyday wear and more formal occasions. Material: The upper and lining are made of high-quality, soft and breathable chrome-free Wild Hide leather. Sole: The ultra-thin 3.5 mm Asana Yin synthetic sole, made with 10% natural rubber, provides maximum ground feel and flexibility, promoting natural foot movement. Comfort: The elastic top edge ensures a customized fit. The absence of an insole enhances the barefoot feeling, which is said to strengthen the foot muscles. Versatility: Lightweight and versatile, they easily fold and fit into a bag.