Rock DFS Mid GTX Women's Light Hiking The ankle's malleolus is protected DFS The ankle's malleolus is protected on both sides by an integrated layer of Poron® Performance Material The Men's Rock DFS II GTX uses AKU's exclusive Dual Fit System (“DFS”) to give you both maximum comfort during your approach and a high performance fit while climbing and scrambling Keep your feet dry in all conditions with the integrated waterproof GORE TEX Performance Comfort membrane The Rock DFS has two separate lace zones that utilize lightweight webbing that wraps around and under your foot which enables you to customize your shoe for the fit you want