fire boots must measure 8 inches from the bottom of the heel to the top of the boot. The boot must be laced;ASTM RatingASTM F2413-11LeatherSeidel Work Leather (7 ½ - 8 oz in thickness)StitchingTechnora® fire-resistant thread-stitchingLast55WeltMcKay-Lockstitch ConstructionSoleVibram® Red X Lug Sole