Without a doubt, the best-selling types of replacement watch straps within the Clockwork Synergy inventory are the so-called “NATO” straps. It isn’t hard to imagine why that’s the case. Clockwork Synergy NATO watch straps are made of a durable, yet flexible, high-quality nylon blend. These characteristics give our NATO straps an exceptional level of performance, demonstrating an uncanny resistance to dirt, water, and wear without compromising the strap’s classic style or versatility with any type of watch. In short, the fact that people want a strap that is equal parts utilitarian and fashionable makes it pretty hard to keep them on our shelves for long!