What are the rules for catchweights?

The Mayweather-Marquez catchweight got me thinking.. Do you have to weigh in specifically at 144, or can Marquez possibly come in a little below that contracted weight? Both have to weigh in right at 144. If they are below they have a choice between doritos and hush puppies to gain the weight. They have one hour to gain the weight, or the fight is off.

Thanks for clarifying guys.

you have to be a household name to create your own weight class. triniweight(170) mayweatherweight(144) it's like if the lakers said, **** 5 on five, where playing 3 on 3, kobe lamar and pau.:D

First rule is you have to CATCH the weight. :D if you dont your lined up for Guzman bout.(Guzman is defending champ) Second rule dont run.(by the way those two are runners) if you do run your lined up again with Guzman bout.(Guzman is runner too) :D

Whatever the set # is, you can't weigh in any higher. It's WW, so JMM gotta be above 140, but not above 144. Anywhere 141-144 is legal. That aint too bad, imo.

Whatever the set # is, you can't weigh in any higher. It's WW, so JMM gotta be above 140, but not above 144. Anywhere 141-144 is legal.