These boots are called Siberian for a reason. Ready to help you stay toasty, they’re constructed with 600 grams of insulation that helps provide cold-weather comfort and heat retention. The OrthoLite O-Therm aerogel-infused footbed helps create a thermal barrier underfoot, helping to block cold and regulate temperature. They’re certified to temperatures as low as -40C/-40F and feature oil and slip resistant all-weather TPU outsoles with deep lugs to help add traction for trekking through mud and snow. There’s a breathable and moisture-wicking flannel lining, non-metallic shank to help with structural support, and cement construction that helps deliver flexibility and durability and flexibility. Lightweight, non-metallic, asymmetrical-shaped toe cap. Meets US and Canadian safety standards including ASTM F2413 impact (I) and compression (C) requirements when tested to ASTM F2412, and CSA Z195 grade 1 toe protection. Meets CSA-Z195-14 safety standards to provide toe protection, puncture resistance and resistance to electric shock in the sole. An integrated non-metallic component in footwear that provides puncture protection to the sole of the foot. Meets US and Canadian safety standards including ASTM F2413 and F2892 puncture resistance requirements when tested to F2412, and CSA Z195 protective sole. Delivers waterproof protection, and also provides blood-borne pathogen resistance as defined by ASTM F1671. Breathable membrane helps protect from diseases caused by blood-borne pathogens, as defined by ASTM F1671. Provides secondary underfoot protection against live electrical circuits, electrically energized conductors, parts or apparatus. Meets the ASTM standards F2413 and F2892 requirements when tested to F2412. A bottom design and method of attachment that provides electrical insulating properties. Meets the CSA Z195 electric shock resistant requirements, as well as ASTM standards F2413 or F2892 electric hazard protection when tested to F2412. 600g of insulation Designed to help reduce foot fatigue by dispersing pressure, support the arch and cushion in every step with an Ortholite® PU footbed and a lightweight high-rebound midsole. OrthoLite® O-Therm™ is a proprietary aerogel-infused foam providing the ultimate thermal barrier against cold and heat underfoot. Lightweight HoverSpring™ foam features high-rebound performance for industry leading underfoot comfort. Specially-formulated thermoplastic urethane compound designed to maintain flexibility in variable weather conditions, providing enhanced traction on wet and frosted ice surfaces, plus slip, oil, and abrasion resistance. Meets the SR requirements of ASTM F2413, F2892, or F3445, when tested to F2913. Microban technology provides an extra layer of protection on footwear fabrics against unpleasant odors, stains, and deterioration caused by bacteria and fungus. Our waterproof footwear incorporates a variety of advanced waterproofing materials, treatments and processes. We start with waterproof leathers that are sealed as part of the tanning process; we then either seam-seal the footwear or use an internal waterproof breathable membrane to help feet stay dry. Tongues and zippers treated with durable water resistant coatings utilize integrated gussets, to further deter water entry.