- Jil sander's new early spring thick-soled slippers are simple and elegant, with fashionable styles and can be worn in various styles, allowing you to stay smart and stylish when working from home or relaxing. They are super stylish and look really cute on your feet. It’s a bit hard to refuse. It’s soft and comfortable and not easy to scratch your feet. Upper: Sheepskin cross strap. Inner: Sheepskin sole thickness: about 2.5cm. Sole: Italian leather outsole. Size: 35-39 (40 is custom-made and cannot be returned or exchanged).