1. Weigh-in happens 3 - 4 hours before the prelims 2. Fighters get a few hours to re-hydrate a few pounds if necessary 3. Weigh in again right before the fight 4. Any fighter that weights over 5% of the weight limit gets fined 10% of their purse for every pound over (e.g. a WW can't go over 178.5 lbs) Enough of this 24 hour re-hydration bullshit; weight classes exist for a reason. Come at me, Sherdog.