The Joist 11-inch Waterproof boot features layers of comfort with a J-Flex Flexible Comfort System insole, the Justin Stabilization Technology, Ortholite Comfort Foam insole, and a Dri-Lex cover. Its multi-density rubber and EVA combination outsole offers lightweight durability and meets the standards for electrical hazard footwear so you are guaranteed protection against open circuits of up to 18,000 volts. It also provides an Achilles Relief System that elevates comfort by using stretchable material, high-density foam, and moisture-wicking anti-microbial lining to provide flexibility, support and breathability.