Floyd Mayweather promotes his limited edition ‘Legacy’ t-shirt ahead of his 'last fight ever' against Andre Berto

Floyd Mayweather took to Instagram to share a photo of himself showing off his limited edition ''Legacy' t-shirt as he prepares for final fight against Andre Berto at the MGM Grand in Las Vegas on Saturday.

The 38-year-old undefeated boxing legend who's promoting his new 'Legacy' t-shirt between his beloved Bugatti Veyron supercars, says portion of the profits from the t-shirt sales will go to his foundation – which works to empower communities.

''Get my official limited edition ''Legacy'' tee now and support the Floyd Mayweather Jr. Foundation in my last fight ever. Link to buy in my bio #FightForLegacy #September12th'' Mayweather captioned the above photo.

The limited edition shirt is only on sale until September 19 and costs about £16 ($24.99).

Mayweather could go 49 undefeated against Andre Berto and has promised to retire from the sport after bout on Saturday.

A win over Berto would see Mayweather equal Rocky Marciano's 49-0 winning record.