Madewell The Harper Mule in Leopard Calf Hair. Our signature slip-on mules return in leopard calf hair. With the same foot-hugging fit and oh-so-walkable stacked heels, you'll find yourself reaching for these over and over. Cushiness alert: We've added an extra layer of padding to make them even comfier. • 2.5" heel • Calf hair upper • Man-made sole Size 7. Excellent condition, like new. Sold out online.