Top grain leather uppers, double stitched and re-enforced at stress points. Calf-skin liners keep moisture and heat down. Removable insoles, perforated to allow air circulation all around the foot. Soft-Air Technology mid-soles provide light airy cushioning to every step, relieving impact on the knees, hips and lower back. Super compression outersoles provide maximum shock absorption for the most ambitious walker. The natural rubber outersoles are long lasting and naturally slip resistant.