- Jil sander's new early spring back hollow sandals, catwalk style metal leather low heel series, elastic band design at the back, easy to put on and take off but not easy to fall off, sweet and cool, a little irresistible, soft and comfortable Not easy to scratch the feet. Upper: cowhide. Lining: sheepskin. Heel height: 4.5cm. Sole: Italian genuine leather. Outsole size: 35-39 (40 is custom-made and cannot be returned or exchanged).