Extreme cold can't keep the job from getting done in the Justin WK4980 10'' EH WP work boot, which keeps feet warm with impressive 600g Thinsulate® insulation, while a steel shank and a J-Flex insole provide support and cushioning to prevent fatigue. Item # 478483600g Thinsulate® Ultra insulationDual-side pull-on loopsElectrical Hazard ProtectionFabric liningJ-Flex Flexible Comfort System® insoleJ-Flex®Meets ASTM F2892-11 standards for Electrical Hazard protectionRubber outsoleShipping Note: Please allow up to 5 days extra shipping time in addition to selected delivery method. Orders of footwear from this brand may take up to 2 weeks for delivery.Steel shankThinsulate™ UltraWaterproof interior bootieWaterproof leather upperStyle Number: WK4980