Blundstone Men's 871 Smelter Boot 100% Leather Imported Synthetic sole Shaft measures approximately 7.5" from arch Heel measures approximately 1.75" Dip tested to 1760 degreef in molten aluminium and 2768 degreef in molten steel and sole heat resistant to 572 degreef Lightweight, shock absorbing softcell dual density rubber sole, with 5millimeterheavy duty tread-oil, acid and organic fat resistant Non intrusive metatarsal guard protection Black flame retardant leather 'critical application' smelter boot-230millimeterheight Compression resistant 8 point ssoftherm upper insulation against radiant heat, kevlar stitched seams resist liquid metal splash and immersion, velcro secured flaps for individual fit adjustment-fast exit and entry