DUREVA outsole - weighs nearly a pound lighter (per pair) than our already - lightweight comparable boots - DUREVA is our exclusive leading-edge fusion compound durable enough to - eliminate the need for a secondary rubber sole and provides exceptional - comfort energy return and stable footing on a variety of ground surfaces - Built on a running shoe platform to provide optimum comfort and - performance - Multi-lug tread is designed to provide silent footing by quietly flexing and - bending over ground elements - a Nylon shank