The WK4624 has a HYBRED Ousole 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. 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.