Danner Men's Crag Rat Hiking Boots Won't Be Home until they come miles from everywhere, marching through the mud overcoming rocks or stomping through snow. The entire package is built on a Vibram Tsavo outsole with deep lugs designed to grip all types of rough terrain and provide confidence allowing you to take the Crag Rat almost anywhere. At the top of the sole there is a polyurethane insole Molded PU midsole and rigid nylon shank provide ample support and protection from sharp rocks and rough terrain which are the preferred habitat of the Crag Rat. The Crag Rat is also equipped with Dynamic Response stabilization system made of polyurethane and Pebax , which provides increased rigidity lateral stability and energy return therefore we can travel longer distances with less pain and effort. Finally , soft but the durable full-grain leather upper is complemented by a waterproof and breathable GORE-TEX membrane which keeps your feet dry while marching in the rain muddy or snowy weather on the way to the next camp.