The boots are all designed with the following features.

Full Leather 3 piece upper build
Harder wearing translucent sole resistant to fuels, lubricants and high temperatures.
Lighter Air Cushion midsole with millions of tiny bubbles to give excellent shock absorption.
Better Grip, with multi directional cleats.
Anatomic Support provided by superb cradling of the foot, to reduce foot and leg strain.
Tougher and supple full grain leathers ( 2.5mm) are 30% thicker than normal work boots