Alright new guy here wanting to get schooled on grappling or mma shorts. What makes them difference than ACTUAL board shorts (minus the split seem). Also, I notice a vast majority of suppliers carry very spaced out sizes (30", 36", 40") do these adjust to match a smaller waste than listed? Like I am a 31", would I synch down a 36", or squeeze into a 30"? Finally, what are the most "affordable" yet dependable I should be looking at? I saw the new Korals with the ripstop were only $42 compared to most of these shorts being from $49 to $64... tHanks!