Women's Leather and Vegetable-Tanned Leather Thong Sandals. Women's red thong sandal Mario Doni Women's Sandals Model: Gorgona Insole: Natural Leather Sole: Natural Leather Heel: 3 mm Leather Upper: Genuine Vegetable-Tanned Leather Color: Red Every stage of the sandal's production is carried out within our workshop, allowing us to oversee the product from the selection of raw materials, through each individual stage of processing, to finishing, packaging, and shipping to the customer. The sandal-making process begins with cutting the leather for the sole, insole, and heel, and cutting the genuine vegetable-tanned leather for the upper. The assembly of the components is done for each individual customer, taking into account the variations and modifications requested. The coloring is done by hand, at the end, and for this reason, each sandal is a unique piece. The finishing is done with waxes, creams, and natural oils that give a silky touch and an antique effect. Each sandal comes with a warranty certificate from the genuine vegetable-tanned leather consortium.