YOUTUBERS WingsOfRedemption and Boogie2988 weighed in at a combined 57 STONE ahead of their Wembley Arena showdown.
The two Americans are set to go head to head on the undercard of KSI vs Joe Fournier on Saturday night.
And, according to The Mirror, the bout will be the heaviest boxing fight on record.
Boogie2988 tipped the scales at 391.6 pounds during Friday’s weigh in.
But WingsOfRedemption was the heavier of the two men, coming in at 404.3 pounds for the fight.
That is a combined weight of around 800lbs – around 57 stone.
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They are set to face off during the Happy Punch prelims on the Misfits 007 card ahead of KSI vs Fournier.
The bout will consist of three, 90 second rounds.
And Boogie said he is hoping the fight will help inspire fans.
He revealed: “I’m going into this thing with the plan to win. But if I could make it all the way through three rounds I will be happy with that.
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“If I’m still standing at the end I will be very proud of myself.
“There are going to be some people tuning in to watch two fat guys and make fun of them.
“There’s also hopefully going to be a few people who are inspired by this.”
Speaking on the bout, KSI said: “Oh my God. If someone would have told me this would happen 10 years ago I would have laughed and blocked them.
“Fam I still can’t believe it’s happening.”
Source: Boxing - thesun.co.uk