- Jil sander Jil Sander 23 new front zipper thick-soled short boots. The upper is naturally rich in unique luster. The square toe and front zipper design highlight the Gothic style with inherent temperament. It is simply not too handsome! A must-have item for fall and winter! Upper: calfskin, lining: sheepskin, sole thickness: about 4cm, sole: original foam rubber outsole, size: 35-39 (40 customized, non-refundable),