Single-piece upper construction with Hydrobloc-treated leathers allow for more reliable performance over the life of the boot given less stitching and opportunity for snagging on debris Gore-Tex Extended Comfort membranes allow for maximum breathability with guaranteed waterproof protection for the life of the boot Vibram Pillow outsoles with spaced triangular lugs offer excellent grip in a variety of conditions, including mud EVA midsoles are very lightweight and add to the lightweight performance of the boot's construction The ZBPK backpacking last + ZLF (Zamberlan's Ladies Fit) offers exquisite fit and comfort for women