I'm 5'8" at 170 lbs with a 31" waist. While the 30's fit in my waist, they just felt really constricting. The 32's were a comfortable fit but the only way I could get the waist to fit was to move the velcro adjusters slightly past their limit.
It's so frustrating that manufacturers can't figure out the odd number sizes!
Also worth noting is that I also bought the Fox Indicator Short size 32 and they fit pretty perfectly.