Steel shank Welt construction ASTM F2413 protective toe classification ASTM F2413 electrical hazard standard 1" heel Full Wrapped Foam Cushion Insole Polyurethane Lite-Lug Outsole Soft Tumbled Leather Uppers Stitched Rubber Bumper Guard Workshoe Last 6 Inches in height Impact testing determines the amount of protection to the toe under various foot pounds of force. Compression testing determines the amount of static pressure a steel/composite toe cap can withstand. Our boots are I75/C75 Footwear is built with nail-free construction to help insulate you from the ground to slow down conduction, but is not intended to be primary protection against electric shock. Leather footwear must be dry. Our electrical hazard boots meet and exceed ASTM electrical hazard standards.