100% cowhide leather ballet flats. Buckled ankle strap closure. 100% goat leather insole. Rubber soles. LEATHER: The material used to make each product has its own unique features. Any possible markings or color variations are signs of the authentic nature of the leather used. SIZE 40: Shoes available in size 40. STARFIT® TECHNICAL INSOLE FOAM: Flexible technical insole made with polyurethane foam. Comfort, cushioning, and durability.