corbeau.com
At the bottom there’s a size chart. The names are a little weird between standard, pro, and wide. With my experience with the pro I have a narrow waist and it’s tight but I can deal with it. I guess it depends on what you plan on doing with it.All I saw on that link was the Pro and Wide, but I don't see the normal FX1? I might have to email them? I have a 38" waist, so I was thinking the FX1 would be a better fit for me?