The upper on this stylish ankle boot is made out of 100% calf leather, making it extremely soft. The Rotterdam also comes equipped with a block heel of about 2 inches. This provides good height as well as great stability in the heel. The rich colors allow it to be used as both a casual and a more dressy boot. This boot also has a rugged rubber outsole, further contributing to the longevity of the ankle boot. We were able to get the Rotterdam in the black and cuero leathers. Two colors are available in the slip on Rotterdams, as well as one color for the lace up Rotterdams. This shoe comes in the european sizes as well. The Rotterdam is also available in two taller styles.