Justin Men's Balusters Bay Gaucho Work Boot (4444) pull on manmade outsole A durable rubber tread manmade outsole this combination gives the outsole flexibility 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 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