Made of high quality nubuck leather. The heel and toe boast proper rock protectors. Thanks to the Gore-Tex membrane, the shoes are completely waterproof. The Flex lacing system comfortably tightens the shoes along their entire length. Vibram Apptrail sole. The balance of the insole adapts to your feet thanks to the slow-reacting foam. Shock absorption in the midsole. The shape of the midsole allows for normal pronation while limiting excessive pronation.