The Korkers SnowJack Pro Safety Winter Boot is tough and ready for the work site. The men's insulated work boots offer customized traction on the fly and a composite toe that meets ASTM and CSA testing standards. The Korkers insulated work boots for winter, built rugged for the job, are waterproof to defeat rain, snow, and ice in subzero temps 24/7. SnowJack winter safety toe work boots feature a 100% waterproof construction the breathable bootie and waterproof leather keep feet bone dry. With 400g of 3M Thinsulate insulation, your feet stay warm at moderate activity levels down to -30 degrees Fahrenheit. In addition to the composite toe, the SnowJack Pro's Lenzi puncture-resistant midsole protects the foot from sharp objects such as nails and glass. SnowJack Pro work boots come with the oil and acid-resistant 90 Degree Sole with aggressive lugs; you can replace them using Korkers' patented interchangeable outsole system. The integrated traction design allows for the safe operation of vehicles and machinery. The winter work boots are backed by Korkers' Rock Solid Guarantee. Laboring all day is hard enough work, so don't make it tough on your feet Korkers SnowJack Pro is fit for the job site every winter day.OmniTrax 3.0 Interchangeable Sole System adapts your traction to meet changing weather conditions; easily change soles (sold separately) as conditions or terrain demandStandard 90 Degree Sole is oil/acid resistant rubber with aggressive lugs and a 90-degree right angle heel to outlast the harshest conditions100% waterproof, breathable bootie construction combined with waterproof leather keeps feet bone dry400g of 3M Thinsulate insulation for the ultimate warmth during intense winter conditions360-degree rand provides superior support and protection without sacrificing flexibilityComposite toe meets ASTM & CSA testing standards; molded toe cap; Lenzi puncture-resistant plate protects feet from sharp objectsComfort rated down to -30 degrees Fahrenheit9 height / 4 lbs. 3 oz. per pairManufacturer's one-year warranty