I had an older version and sold it after 1 weekend due to the fact that it didn’t breathe at all. AS suits are like Porches, so far as when the price goes up, more stuff gets taken out. So, the KMX1, though it’s the priciest, doesn’t have the bulky inner liner that makes the cheaper suits into sweat boxes. MHO, of course.
This is not to slam AS, as I used to wear, and still have, an ancient KMX3.