Kalso Earth Women's Rally Mary Jane Shoes Leather Negative Heel Technology helps improve posture and reduce joint stress. Anatomic medial arch helps promote proper heel strike. Shock-absorbing BioFoam cushioning is made of 70% recycled content. Leather upper, upper lining and sockliner, BioFoam insole, polypropylene midsole, rubber outsole. Care: Buff with a leather cleaner or polish. Wipe off with a dry cloth.