American bison is another tough leather that can take a beating yet also take a shine when need be. Bison custom cowboy boots have been a fan favorite for years due to its deep grain and rich tones. When opting for American bison custom cowboy boots, it is important to note whether you prefer a low grain or a high grain. The high grain is nearly impossible to beat up, but the lower grain can develop a beautiful patina over time. However, it is important to note that bison boots tends to give a little more than your average leather. So if you are looking for a looser fit over time, or something that "grows with you," American bison could be the perfect choice.