These are sized really badly.  I am a size 6-8 in jeans and a medium or small in exercise pants, but due to the reviews I sized up and got large and they still don't fit.  The bottom of the capris won't go past my ankles so my crotch is not much higher than my knees.  So either I need to lose weight to help me wear the pants made to help me lose weight, or I need to return them.  I will note in the two disappointing minutes I tried having them on, I was starting to sweat, so my guess is if you can get them to fit, they will do what they are supposed to.