It's built for comfort with the J-Max® Double Comfort System® that utilizes a mesh spacer foot bed cover that provides extra comfort and a healthy environment for the foot and the J-Max® removable orthotic inserts with J-Flex Flexible Comfort System® with Justin Jel® offers a multi-density polyurethane foot bed including low-density foam to cushion initial impact and provide energy return as you walk. The encapsulated air cells to virtually eliminate compression set so the bounce of cushioned energy return is present for the life of the boot strategically placed polyurethane gel pads in the heel arch and ball area to reduce muscle fatigue for unparalleled comfort. This boot also features the Dri-Lex® cooling system that pulls moisture from the inside of the shoe, leaving the insole dry and cool as well as a durable dual-density polyurethane slip resisting outsole that meets ASTM F2892-11 for electrical hazard safety footwear standards.