Get the durability you expect from a quality work boot and the breathability you need in warmer, arid conditions with the Sonic 8". The leather upper is flanked by abrasion-resistant and highly breathable Perspair(R) panels, allowing for a high level of ventilation. Incorporating a bi-fit board and a Resurge midsole for lightweight stability and cushioning underfoot, this boot delivers running shoe comfort in a functional, rugged platform. Design: Suede and abrasion-resistant synthetic Perspair(R) upper Mesh lining Speed lacing system for secure, enhanced fit Cushioning PU footbed Resurge low-density EVA midsole provides superior rebound and energy return with minimal weight Bi-Fit stability board for underfoot comfort, reduced weight and added forefoot flex Danner(R) Sonic outsole for traction in diverse terrain Meets AR 670-1 (Army) and AFI 36-2903 (Air Force) requirements for optional wear