El Naturalista Women's Nf44 Zumaia Flat Sandal 100% Leather Imported Rubber sole Handmade in Spain by skilled craftsman with years of experience Natural leather with a rustic appearance treated with natural oils giving it excepional softness A comfort last with a slanted design that fits with the natural shape of the foot These anatomically designed insoles are made of recycled cork The outsole is made of natural rubber for flexibility, durability and shock absorption