LAST - Enhanced toe spring and rocker profile for efficient propulsion, underfoot contours and profile enables smooth gate, refined forefoot, anatomical design for enhanced lockdown UPPER - Abrasion-resistant mesh, reinforced welded overlays, integrated tongue scree gaiter, recycled laces and webbing. INSOLE - O FIT Insole x Ortholite Eco BOTTOM - Inertia of Motion (IOM) System, ACT Nitro dual-layer midsole comprised of nitrogen-infused foam is light, durable, and provides efficient energy return, molded rubber heel clip, carbon fiber plate, Molded TPU heel clip, deceleration hinges, Trail Tread rubber, gaiter channel CONSTRUCTION - Tear Away Strobel Lasted