These Crag Rat GXT Hiking Boots by Danner were designed to battle ridgelines and other tough, rocky terrains. They are 100% waterproof with a breathable GORE-TEX liner. The molded PU footbed in combination with the dynamic response system allows for peak athletic performance and comfort. The dynamic response system provides optimal stability featuring Pebax and dual density PU for torsion control, springboard return, maximum support, and shock absorption. The Vibram outsole is crafted for traction over rugged terrain and high angle terrain.