Boat shoes in 100% cowhide leather. Adjustable lace-up closure. Lace-up detail on the side and welt on the instep. Flexible insoles in 100% sheepskin. Treaded 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. STARFIT® TECHNICAL INSOLE FOAM: Flexible technical insole made with polyurethane foam. Comfort, cushioning, and durability.