Sorry I interpreted your sweaty cinch comment as hot. Supposedly neoprene is suppsed to use the sweat to lubricate and lessen friction. The one I had did not, it galled. So what I meant was to find a cinch that breathes so the sweat can evaporate.
Buying stuff for horses is so much fun though!(that's where my $$$ go!)
You just need to find what workd for you and your horse. Sure their may be some experimentation but if you buy something and it doesn't work, then resell it. You might take a little loss since it is used but it wont be a total loss :)
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.