This is a very rare piece of memorabilia. This pair of Everlast boxing trunks has been signed by one of the most recognized and popular athletes of all time. Muhammad Ali has signed these trunks "Cassius Clay". He rarely signs Cassius Clay, therefore making this item even more unique. This was signed at a private signing with Steiner Sports and features a tamper-proof hologram from Steiner Sports as well as a Certificate of Authenticity from Collectibles of the Game.