These official Everlast boxing trunks have been signed by one of the most recognized and popular athletes of all time. Muhammad Ali has signed these shorts "Muhammad Ali AKA Cassius Clay". He rarely signs Cassius Clay, therefore making this item even more unique and valuable. 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 Steiner.