The Zamberlan Vibram soles with dual-density PU midsoles (one for comfort, one for support) Resolable ZBPK performance lasts are designed to provide the ultimate in comfort while supporting the requirements for both precision on the mountain as well as comfort with heavier loads A sleek 3/4 RRS (Rubber Rand System), constructed using an improved rubber compound with improved elasticity, also features a beveled under-edge to prevent catching and peeling Zamberlan 980 Outfitter GTX RR Hiking Shoes - Men's, PFAS-Free, Brown, 9, 0980ZBRM-43-9