Patagonia Foot Tractor Wading Boot - Aluminum BarFeature Vibram Idrogrip sticky rubber sole with aggressively shaped (multi directional) aluminum bars that are just hard enough to cut through algae and slime, yet soft enough to conform to rock surfaces. They also grip well on muddy trails, won't accumulate snow, don't hold moisture, and don't tear up drift boat decks. In other words, they offer the wading traction we've been looking for all our lives. Order one size up.