Men's Carhartt FM5455 Millbrook Mid Nano Toe 6" Work Boots Built for demanding workdays, this 6-inch lace-up work boot delivers dependable protection with comfort that lasts shift after shift. The Nano Composite safety toe provides lightweight, non-metallic protection while meeting ASTM F2413-24 safety standards. INSITE® footbeds offer high-rebound cushioning with podiatrist-designed arch support to reduce fatigue on long days. Finished with a durable, oil- and slip-resistant rubber outsole, it’s designed to keep you steady on tough surfaces.