Our soles are not only built of a special shock absorbing Polyurethane (PU) midsole for maximum comfort on hard surfaces, but we also use the most advanced form of Polyurethane (known as TPU) to design and create our outsoles. This coupled with our unique sole pattern and layout, gives our shoes a significant advantage in being slip-resistant, abrasion resistant and flexible in different environments. Refer to our boot rating table on the shopping page for more information on this and what makes out footwear so special.