Deontay Wilder has blamed his elaborate ring-walk costume for his WBC heavyweight title defeat by Tyson Fury.
The American, 34, said his costume was too heavy and as a result he "didn't have the legs" for the fight.
Britain's Fury, 31, produced a dominant display to win the title in Las Vegas on Saturday when Wilder's corner threw in the towel in the seventh round.
Wilder also told US media he will exercise his rematch clause for a third fight against Fury.
"Fury didn't hurt me at all, but the simple fact is that my uniform was way too heavy for me," Wilder told Yahoo.
Wilder said the costume, which featured armour, a mask and a crown, weighed at least 40 pounds (18.1kg) and was a tribute to Black History Month.
Fury was carried to the ring on a throne, while also wearing a crown.
Fury floored Wilder with a jab and right-hand combination in the third round before a left hand to the body sent the previously unbeaten Wilder down again in the fifth.
Wilder was taken to hospital after the fight but said he did not suffer a concussion, broken eardrum or broken jaw as had been speculated, but did require stitches to close a cut in his ear.
He also criticised assistant trainer Mark Breland for stopping the fight.
Wilder has 30 days to invoke the rematch clause in his contract in order to try and reclaim the title from Fury, having drawn their first encounter in December 2018.