When we have 30 hours to cover 100 miles of technical trails We're wearing the Dynafit Ultra 100 GTX trail running shoe. Generous stacking of cushioning underfoot softens impacts from rocks and roots and the maximum volume fit allows you to avoid anxiety during long runs. This couple , equipped with Ghillie lacing and Dynafit Heel Preloader technology keeps our legs locked and transitions loaded providing a powerful lead every time. Rain and snow are protected by an impenetrable GORE-TEX Invisible Fit membrane and a seamless, gusseted tongue prevents debris from getting inside. Textured Multi-directional Vibram lugs bolster our stability on muddy climbs and grip slippery rocks on water crossings ensuring that every ounce of energy propels us forward.