Ariat describes the Men's Sierra Boot as mountain tough. Since the Sierra's sole resists abrasion and heat of up to 750 degrees fahrenheit, it's a good bet that these boots'll make it through quite a lot of your rough and tumble wear. The upper is made of premium, full grain leather, which is set on top of Ariat's ATS midsole. The ATS midsole consists of a gel cushioned footbed for all day comfort, with a built in heel stabilizer for even more support. When you combine all of this, you end up with a boot you can rely on, and one that won't quit on you before the work is done.