Fire Resistant Rough Out 10" Leather Uppers - 2.8 mm one-piece vamp construction and seamless tongue increases durability and precision molds to each foot. Featuring Hot Zone Kevlar stitching and boot laces for fire resistance, while the full-length 7mm tapered nylon midsoles and high traction, deep lugged K-73 Fire outsoles ensure fireproof performance and keep you on your feet. Extra padded Soft Collars and flex notch design results in bolstered support and lasting comfort. Reinforced double and triple stitching in high wear areas for added durability. Lightweight, breathable non-waterproof lining provides comfort on the fireline and conforms to NFPA 1977 Standard Requirements - Independent Laboratory tested for compliance with NFPA 1977, Standard on Protective Clothing and Equipment for Wildland Fire Fighting 2016 Edition.