The unique combination of the bison&';s strength and flexibility is prominent in our entire Bison collection. The moment you slip on a pair of these one-of-a-kind work boots they mold to your feet because of how soft and thick the hides are. Expect no break-in, instant comfort, and long-lasting support wherever you roam. Like its namesake, the Superduty Bison is a born survivor: known to walk straight into the head of a storm, unfazed by uncertainty. The ultimate irony of the bison leather is that it blends a near-impossible combination of softness and strength. Whether you need them for 8 hrs or 24 hrs, the Superduty Bison will show up again and again to offer support that keeps you moving without straining your feet or calf muscles. Specifications Shaft Height - 10" (boot heels excluded) Uppers - Smooth 8oz premium oil-tanned USA leather Lowers - smooth 8oz premium oil-tanned USA leather Thread - High strength, TechnoraA(R) thread, fire resistant to over 900 AdegF Hardware - Traditional brass high-quality eyelets and speed hook combo Insole - Genuine oak-tanned leather Midsole - Genuine oak-tanned USA leather Arch support - USA leather Sole - Vibram 100A(R) Honey Adhesive - Fire ready adhesives throughout boot construction Origin - Handmade in the United States of America Some Bison boots use fire-rated materials, but Bison is not recommended for fire use. Check out our Fire Collection instead. Disclaimer Some Bison boots use fire-rated materials, but Bison is not recommended for fire use. Check out our Fire Collection instead. *We have updated our construction method on all Superduty & Fire Inlander products from our 270 Stitchdown to a 360 Stitchdown construction. Both of these methods meet the same NFPA 1950 standards. If you receive a 270 degree construction, and wish to specifically have a 360 construction please email general@jkboots.com*