The most important part of a leather fire boot may not be what first comes to mind. Many might think it’s the leather, or the liner, or the outsole. But in reality, the most important part of a leather fire boot are the seams (i.e. the stitching). The seams in a boot represent the weakest point, and thus the most susceptible to breakage. Therefore, it is extremely important to ensure that your leather boots have the best quality stitching possible.
Although the quality of the thread used in the stitching is important, the fact is that all leather boot manufacturers use the same type of stitching thread. A more appropriate way of determining if your boots have the best stitching is to just look at the seams and count the number of stitching lines. The more stitching lines, the better.
Conclusion: Look for triple stitching throughout the leather fire boot you want to purchase.