What is a rehydration clause?

A rehydration clause is a term often found in contracts between athletes and promoters in combat sports, such as boxing or mixed martial arts. This clause requires fighters to weigh in again on the day of the event to ensure they have not gained an excessive amount of weight through rehydration after the initial weigh-in.

The purpose of a rehydration clause is to prevent fighters from dangerously dehydrating themselves in order to make weight for the weigh-in, only to rehydrate rapidly before the fight, potentially putting themselves at risk for health issues. By monitoring fighters' weight on the day of the event, promoters can ensure that fighters are competing at a safe and healthy weight.

If a fighter fails to meet the weight limit specified in the rehydration clause, they may face penalties such as fines or even being pulled from the fight. Rehydration clauses have become more common in recent years as a way to prioritize fighter safety and ensure fair competition.