The Rocky IronClad D30 10 Inch Pull-On Steel Toe work boot is made with Rocky's guaranteed waterproof construction and has a steel protective toe. The D30 Advanced Metguard is a specially engineered material made with intelligent molecules. They flow with you as you move but on shock lock together to absorb the impact energy. Used as an internal Met D30 meets ASTM standards. It has a lightweight, shock absorbing and flexible EVA midsole which is much lighter, more comfortable and reduced fatigue. This boot also has the Rocky Air-Port vented polyurethane cushion footbed which circulates air with every step.