The Iron Ranger Boots have been protecting the feet of miners for more than a century, so we feel good about them protecting ours, too. Oil-tanned leather comprises the upper for added protection, while the leather insole conforms to our foot's natural shape to become more comfortable over time. A steel shank increases both stability and support for long stretches on our feet, and Vibram's 430 mini-lug sole won't crack and lose durability after a few years like all-rubber soles sometimes do.