These player-worn shorts were personally hand signed by Pete Alonso during the 2018 MiLB season with the inscription "PLAYER-WORN 2018." They were obtained under the auspices of the Major League Baseball Authentication Program and can be verified by its numbered hologram at MLB.com. They also come with an individually numbered, tamper-evident hologram from Fanatics Authentic. To ensure authenticity, the hologram can be reviewed online. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.