The WK4643 has a HYBRED Outsole resistant to Heat,Chemicals, Oil, Gas, Abrasion, Chips Slipping and Excellent Marking rating. Justin J-Flex® Flexibile Comfort Systems patented foot pampering technology makes Justin Boots the most comfortable Western Boot you will ever own. Justin Stabilization Technology® dual-density medical memory foam inserts stabilize the foot, while still allowing it to move when needed. Justin ASTM Electrical Hazard Rated boots provide protection from open electrical currents up to 18,000 volts. Shark Tec Tuff® heel Counter for Durability with Justin's Achilles Relief System® eliminates weak spots in foot comfort by using stretchable material, high-density foam, and moisture-wicking anti-microbial lining to provide flexibility, support and breathability. Composite safety toes meet safety standards without weighing you down and provides security and comfort, meeting or exceeding ASTM F2413-11 standards impact compression and Electrical Hazard at a fraction of the weight.