Anti-Static, Fuel Oil Resistant Outsole, Fully Sustainable Packaging, Internal Digging Plate, PS Rated Aramid Protective Midsole, Recycled Materials, Scuff Cap, Small Sizes, SR Slip Resistance, Steel Toecap, Water Penetration & Absorption of Upper, Water Repellent Upper, Waterproof Membrane. RF121 Mason features Activ-Step® Comfort Footbeds, BOA® Fit System.