Tsongas Isivina sandal, a toe-thong sandal, has been hand stitched for comfort and strength and features an intricately designed upper in this season on trend leather colours. Without the use of a hard insole board in the Vitto unit, Tsonga can achieve extra flexibility and comfort. The air cell lining is fully breathable whilst the memory foam insole provides a relaxed feel against the foot. The Vitto sole has been made from PU (polyurethane) which is both light and flexible and offers a slight heel.