Ordered 18 mm because I had this belt. It didn't fit, it was loose. I took a caliper and measured. It turns out it's only 17mm. The strap itself is too long. Maybe you need multiple length options? It's hard to imagine someone with a large enough wrist would need a strap that long. I recommend cutting off the excess. The material wears out but can be cleaned up. It feels more like plastic than leather, and not even soft-touch plastic, but hard paper. It looks good and works. But leaves a lot to be desired. Gave 2 stars instead of 1 because I can see the strap design itself is pretty hard to work with.
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