The new Korkers Triple Threat Aluminum bar sole is equipped with soft Aluminum Bars that run across the sole to cover the entire underside surface of the boot. The bars will conform to any rock surface providing maximum traction on even the most treacherous rock surfaces. Easily swapped out for the other Korkers soles, this Aluminum bar sole isalso customizable with discs or carbide spikes. In addition, the Aluminum keeps the weight down. All in all, this is a great sole for those anglers who need more grip and in and out of the water.