The Nestfit system cradles your feet, accounting for every contour as it follows the natural flow and design of the foot. The upper, midsole, and outsole works together like never before. The IceLock/HyperGrip sole provides traction in any condition. Variable density EVA midsole insole lifts the arch, cushions key strike zones, and strenghtens your stride. The Nubuck leather upper sheds water and molds to the contours of your feet.