Built tough and able to withstand some of the toughest conditions imaginable, the Fire Flash Xtreme is built to handle structural fires, wildland fires, HAZMAT conditions, and Urban Search and Rescue missions. Comfort, flexibility, protection, and safety are the keys for this boot. With KEVLAR® protection against cuts, the tough upper leather also features HAIX® Sun Reflect leather which reduces the heating effect of direct sunlight, keeping the leather and your feet cooler on long missions. CROSSTECH® inner liners are waterproof and breathable and also offer chemical and bloodborne pathogen protection. Combined with the never duplicated Secura Liner®, you are ensured a liner that will never pull out or wrinkle over time. The unique lacing/zipper system offers a personalized fit to your foot, provides a two zone lacing system so that the upper lacing can be adjusted independently of the lower lacing, while, at the same time, the lacing is fully protected with leather to prevent snagging on sharp objects. The rubber nitrile sole is oil and fuel resistant, self cleaning, and high voltage resistant to 14 KV. You never know what is underfoot from broken glass to nails, but with the stainless steel built into the sole, you have ultimate puncture protection. All threads and laces are flame resistant Nomex. Certified to NFPA 1971-2007, NFPA 1992-2005, NFPA 1977-2011, NFPA 1951-2007 CAN/CSA Z195-09 and ASTM F2413-05.