According to this Boston Globe piece, Pena wore the wristband because he considered LMontro a “lucky charm” (Here is a close-up of the wristband). A quick look around YouTube shows that LMontro is the “stylist for the baseball stars.”
While Pena may consider the wristband lucky, we wonder if Major League Baseball might consider it illegal. Wouldn’t the wristband be considered a form of advertising for the stylist? Unless the teams are playing in Japan, advertising on baseball uniforms is forbidden.
Here is Manny Ramirez wearing a similar wristband.
Sounds like a case for Paul Lukas at UniWatch.
Montro99 is Carlos Peña’s “lucky charm” [Montro 99]