A lot of buyers ask us what the primary differences are between NATO and Zulu straps, essentially, the main differences lie in the the buckles and keepers; Zulu straps have much rounder and thicker buckles, whereas the NATO has thinner and more rectangular buckles, the other difference is that NATO straps have an additional strap that slides through 2 buckles, this means that you end up with two layers of leather under the watch, instead of one with a Zulu so, with a Zulu strap, the watch will not sit so high as it would with a NATO strap.