Oil-, slip-, and heat-resistant rubber outsole with smooth tread design to ensure no imprints are left in freshly laid asphalt, HTS Heat Transfer System air intake vent allows for airflow, HTS Heat Transfer System exhaust vent on inside heel allows heat to escape, Dual density Polyurethane midsole for comfort, 2mm rubber welt midsole for durability, Genuine leather welt is more resistant to chemicals, hot tar, and asphalt, Durable toe stitch reduces chance for sole separation, Heavyweight oiled and waxed full-grain leather, PRIMALOFT Aerogel welt insole insulates against heat migrating from hot asphalt, Abrasion-resistant, hyper wicking breathable nylon lining package and dual density breathable PU removable footbed,