Construction: Double stitched, seamless binding Entry/Closure: Dual external directional pull tabs, side entry system with triple Loctite laminated, die-cut hook and loop straps. Also comes in velcro straps. Heel Cup: 3-D molded SHARK TOOTH HEEL, Mad Rubber Formula #3 Midsole: 1.3mm 3-D molded nylon midsole Rand: 2.2mm Mad Rubber Formula #4 Sole: 3-D molded dual density, dual thickness Hooker sole, Mad Rubber Formula FX5 Upper: Ribbed AGRO Power upper with vents, 2.0mm SYNTHETIC Upper