Red Sox MassMutual (2 versions). This is an advertising patch. The Red Sox have two versions of this patch. One is navy with white writing and the
MLB uniforms will have advertising beginning in the 2023 season
Milwaukee Brewers Add Northwestern Mutual Logo to Jersey
Red Sox reveal first-ever uniform advertisements; MassMutual
Red Sox reach $170 million jersey-patch deal, Mets also interested
Boston Red Sox Announce MassMutual Patch on Jerseys Starting in
Boston Red Sox bag US$170m MassMutual jersey patch deal, says
Bruins reveal cybersecurity firm Rapid7 will be first sponsor of
Boston Red Sox bag US$170m MassMutual jersey patch deal, says
MLB's Red Sox land MassMutual as jersey patch sponsor - Sportcal