The Calf Strap Boot with Rugged Core is inspired by military tank history. In the intense heat of battle, tank driversï' laces would often burn, so many would wrap belts around their boots to keep them on. With the Lauren boot, this fact has inspired four cross-over straps wrapping around the slim upper with two buckles. Material: Burnished Wyoming leather. Heel loop. Specifically designed to fit a female foot. Goodyear-welted, the upper and sole are heat-sealed and sewn together. Dr. Martens air-cushioned sole.