TheShoeLife.com - The sole of boots are divided into three parts, the front sole, mid sole and bottom sole. The upper sole is actually soft so that people might not get hurt,and the other two soles are really stiff and flexible. The insole or front sole must have extra cushioning or the person will have difficulty in fast movements. Normally the boots are constructed from the blend of different materials including leather, synthetic plastics and resin rubbers so this is even more stronger than the usual shoes.