Actually, there is nothing fancy or complicated about full-grain leather. It’s just the most natural form of leather, and that’s what we love about it. It is the least commonly used form of leather, because of its high price. Full-grain leather is the strongest and most durable part of the hide (skin), and it’s located just underneath the hair. Due to its tightness, it is very strong, but also very resistant to moisture. This is very important, especially when it comes to watch leather straps. Over time, full-grain leather also develops a gorgeous patina, which means that the leather straps will keep and develop their luster over time.