From responsible leather certified by the LWG all the way down to recycled thermoplastic rubber in the soles... These sustainable heeled mules look as good as they feel. Sap Shoe Silhouette: HEELED SANDALS. Sap Upper: SLIDE. Sap Heel Type: BLOCK (THICK). Sap Toe Shape: SQUARE. Silhouette: Mule. Toe Shape: Open Square. Closure type: Slip on. Upper: Textile. Main: Woven. Sole: Textile. Heel Height: 4.25. Platform Height: 1.75.