Oil tanned leather upper Storm Defender® Waterproof breathable membrane allows moisture to escape while keeping your feet dry FastDry™ Technology Lining wicks away sweat for comfort PU Strobel Pad for added comfort and support Cushion Comfort PU insoles provide comfortable support and reduce foot fatigue Shank: Steel Dual density slip-resistant rubber outsole with maximum surface contact Shaft Circumference: 10.2 Inches Heal Height 1.1 Inches Electrical Hazard footwear provides protection against live electrical currents and meets ASTM F2892-18 EH standards ASTM F2892-18 EH Slip Resistant ASTM F3445-21 SR