Kalso Earth Women's Dally Slip-On Shoes Leather Rubber sole Negative Heel Technology promotes a natural stride to help improve posture and reduce joint stress. Anatomic arch supports the medial arch and helps encourage proper heel strike. Eco-friendly BioFoam cushioning absorbs shock to give you soft-feeling steps. Leather upper, spandex upper lining, leather sockliner, BioFoam insole, recycled Strobel midsole... EVA / rubber outsole. Care: Buff with a leather cleaner or polish. Wipe off with a dry cloth.