Constructed from durable hand-lasted rubber and flexible four way stretch 7mm Neo-Techª insulation. Durable, shock-absorbing rubber outsole. Meets all ASTM steel toe and slip and chemical resistance standards. Comfort rated to -40ûF. Satisfaction guaranteed. Steel toe boot may be shipped with gray or yellow toe. 100% Waterproof. Height: 16Ó. Circumference at calf 17". Weight 6lbs per pair. Comfort rated from temperate to -40ûF or sub zero conditions. Natural hand-lasted rubber and a four way stretch inner bootie. Non-slip and non-marking outsole. Aegis antimicrobial odor protection insole. Steel Toe. Available in sizes 7-18. 100% satisfaction guaranteed. Meets ASTM 1677, F2913-11, and D471 2010 slip and chemical resistance standards. Meets ASTM F2413-11 and F2412-11 steel toe standards.