Roberts quickly became a fan favorite in Arizona for his intense playing style, and with his body adorned with tattoos, he was given the nickname "Tatman."
Roberts, who was in the Opening Day lineup for the first time in his career this year, had a hand in creating the shirts, which are being produced by Los Angeles Youth Monument.
"Now it's just a matter of trying to make some money so we can give it to charity," Roberts said. "That's the whole goal of making the Tatman shirts."
Roberts said he has a couple of charities he'd like to donate to, but wants to see at the end of the year how much money he raises to see if he can donate to multiple organizations.