This autographed custom 0n-field style Adult XL jersey has been personally hand-signed by Brett Favre of the Green Bay Packers. This autograph is certified by Beckett Authentication Services (BAS) Witness Certification. That means that a Beckett representative was present when this item was signed. It comes with the numbered authentication scannable hologram with a QR code that verifies the authentication on the Beckett website. The autograph is also certified by Radtke Sports and comes with the Radtke authentication hologram.