increases the skin’s natural renewal process, speeding exfoliation of itchy, over-dry skin at the surface.Flexitol Heel Balm contains a powerful 25% urea based ingredient that nourishes the skin. This comprehensive formula increases the skin’s natural renewal process, speeding exfoliation of itchy, over-dry skin at the surface. Urea breaks down hardened, calloused skin and eliminates cracks and fissures.