Leather uppers. TOMS leather products support responsible manufacturing via the Leather Working Group. TPR Outsole with TPU Toplift: A lightweight rubber that's flexible and provides traction with an elastic heel for added durability. Non-removable Custom CloudBound™ foam insoles for all-day comfort and support. Medial side zip with braided leather tassel for easy on and off. Stacked leather-wrapped heel. Heel height is approximately 2 3/4" Shaft height approximately 6". Your TOMS purchase helps support children's education, health and well-being, giving kids everywhere the gift of better tomorrows.