I spent forever searching around for some definitive measurement guide on Inzer belts but couldn't find anything, so here is my attempt at clearing up some questions.
I bought a 10mm medium lever belt in black. Smells delicious coming out of the box. Belt and lever come disassembled. No instructions. But seriously, it's like 2 pieces and 2 bolts. Easy. Made from some pretty sexy suede, and pretty high quality leather it seems. You can see the different layers pretty well.
I ordered direct from Inzer on 28th of Dec, 2012 and received it on 14th of Jan, 2013. So ~2.5 weeks delivered to Australia. Not bad considering their reputation. I supposed that's because I bought a black one, which they (usually) have in stock.
My waist (measured around my belly button) is 31" when relaxed. Flexed it's around 30" and if i push it way out, around 33". For me, the belt is set exactly to the middle setting, with 5 holes either side for adjustment. Each hole is 1" apart, so the maximum range of settings will fit a ~26"- 35" waist, though i'd be weary of choosing a medium if you're at either extreme (unless that's specifically what you want). I'm a lean guy and I reckon I sized it perfectly.
The entire belt is 36" long and 3.75" tall, 10mm thick. The edges are finished quite nicely and it seems to be a 3ply belt. Very sturdy. There's a 3.5" difference between open and closed.
Compared to my mates 13mm double prong Bobs Belt, they're about the same stiffness. I honestly don't see the reason to get a 13mm, but it's down to personal preference really. I think 10mm is plenty, even for an advanced lifter.
I like this a lot more than my single prong. Because you've gotta wrench a pronged belt on, you've gotta do the same to get it off. This one you've just gotta flip the lever and it's loose. The only downside is getting it completely off takes a little fiddling as the lever is hooked. It gets easier once you know how to do it though.
Hooked lever. Check out the edge finishing!
Overall, I quite like it and i don't think i'll be buying another belt for a very long time. It comes with the Forever Guarantee™, so if it breaks they'll replace it. Awesome. Hopefully the measurements i've provided help out, as i was completely stumped when trying to buy mine. I actually ended up pausing someones video and counting the holes he had, then comparing to his waist measurements.
Would buy again/10