It's not, Roger does it with all of his boxers. Floyd may try to 'show it off' because he knows it impresses people, but it's something that they genuinely use and not just some media day bull****.
Ive been mixing this fast mits in with my pad work,,its just another exercise in boxing that adds to the rest of your work out not a big fan ,,,I'm liking the fast Punch's for the opening shots