Kalso Earth Women's Faithe Clogs Kalso Negative Heel Technology activates leg / back muscles and offers toning benefits. Toes are positioned 3.7 degrees above the heel to shift weight back and help align the body. Latex rubber outsole delivers durable traction. Leather upper, upper lining and sockliner, Biofoam cushioning insole, latex rubber outsole. Care: Buff with a leather cleaner or polish. Wipe off with a dry cloth.