- 100% Polyester - Lace Up Front - Leather Laces - Solid Gros Grain Bind - Leather Outsole - Leather Stack Heel - Leather Sock The De Nada Granada Sofia Open Toe Mule is a handcrafted shoe designed by our in-house artisans. Imagined in an exclusive limited edition print, our open-toe mule features a high-block heel wrapped in leather with lace-up detailing.