Boot uppers are constructed from lightweight microfiber with integrated shanks in the sole for extra rigidity, External Thermoplastic Polyurethane (TPU) protection on the outer ankles, Foam-backed, double-density ankle protectors on the medial side and reinforced toeboxes layered under the microfiber uppers, External TPU shift pads, sliders and heel counters, Plush 3D mesh inner liner and anatomically profiled Ethylene-Vinyl Acetate (EVA) foam footbed, Combination zipper and hook-and-loop closure strap systems, Outsoles constructed with the same advanced rubber compound as the SMX 5 boots