Unique style that works on and off the job is fused with ultimate comfort in the Thunderhead. A CarbonMAX toe-cap is lighter weight, thinner for a better fit and ASTM approved, while the multi-layer construction of EPX technology conserves and returns energy with a stabilizing midsole, cushioning midsole and an EPX footbed. This boot features: Removable dual-density PU EPX Anti-fatigue footbed,Wolverine CarbonMAX nanotechnology safety-toe provides comfortable, lightweight protection, breathable mesh and TPU upper, moisture managing mesh lining to keep feet dry and comfortable, ultra-light cmpression molded EVA midsole, rubber lug outsole for great traction on a variety of surfaces, nylon shank for support and ASTM F2413-11. Material: Mesh, Rubber.