- 100% Polyester - Lace Up Front - Leather Laces - Solid Gros Grain Bind - Leather Outsole - Leather Stack Heel - Leather Sock The Daughters Of Duende Sofia Open Toe Mule is a handcrafted silhouette designed by our in-house artisans. Reimagined in an exclusive limited edition print, our open toe mule features a high block heel wrapped in lavish leather as lace-up detailing takes you from daytime brunches to evening dancefloors. A pop of printed rebellion to elevate daily denim or your next soiree under moonlight.