- Celine's latest thick-soled slippers with electro-embroidered webbing highlight the brand's charm. The double-row parallel/cross strap design on the upper does not pick up on the toes. It is very fashionable and versatile. It is a must-have for summer. Upper: cowhide/original webbing. Inner: sheepskin bottom. Thickness: about 6cm Sole: Original rubber outsole Size: 35-39 (40 is custom-made and cannot be returned or exchanged),