Madewell Women's Sz. 6.5 The Heidi Slingback Sandal in Snake Embossed Leather is in gently used condition. Very lightly used. This slingback sandal has skinny asymmetrical straps and an ever-so-slight heel. In snake-embossed leather, MWL Cloudlift Lite padding. Embossed leather upper. Man-made sole.