Kalso Earth Solar II Womens Size 6 Black Leather Flats Shoes Rubber 3.7-degree incline sole redistributes body weight to help improve posture and reduce joint stress. Anatomic arch support helps promote a natural stride and proper heel strike. BioFoam cushioning, made of 70% recycled content, absorbs shock. Leather upper, leather / brushed fabric upper lining, leather sockliner, BioFoam insole. Biodegradable polypropylene midsole, rubber outsole.