Made for extended backpacking trips in tough conditions. 2.8 mm Hydrobloc® waxed leather upper.Made in Italy.R.R.S. (Rubber Reinforcement System) is a special rubber reinforcement applied to the upper that ensures maximum abrasion resistance, enhances water repellence, and helps the boot to keep its shape during extended use.H.R.T. (High Resistance Treatment) for abrasion resistance.GORE-TEX® lining. Zamberlan® Z-Comfort footbed for added cushioning. Zamberlan® Z.A.S. Air System is a special construction, design method, and choice of components to optimize comfort and make the boots extremely lightweight and breathable.Thermoplastic toe and heel for added support. Vibram® NorTRAK rubber outsole for traction on any terrain.