The Icon Super Duty 4 Boot. The fourth iteration of the industry defining Super Duty boot pays direct homage to it's SD1 patriarch. The visually defining rubber nub interface and clean pattern lines keep the boot's appearance smooth while hidden ghilley laces reduce snag potential. The new bottom unit provides increased support, durability and grip while layered foam increases comfort. The midfoot support strap, with upgraded aluminum buckle, provides increased foot retention. Finally, the reduced toebox height provides a greater range of fitment. The Super Duty 4, the next step in motorcycle footwear.