NRG55 sole material VS regular EVA VS concrete.  

Most athletic work shoes are made with a simple EVA compound that is hard and uncomfortable.  The NRG55's extreme cushioning absorbs your heal strike and returns a responsive performance you have never felt before.   

Built on 2 densities of the NRG55 advanced sole blend, the NRG55 sole turns 55% of the energy it receives and approximately 50% more than the average performance of safety shoes within the same class. More energy return means less wasted energy and more energy left in your tank.