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
2023 Boston Red Sox MassMutual Advertising Jersey Patch - NAVY
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal
Yankees Sign MLB's Richest Jersey Patch Deal at $25M a Year
Boston Red Sox, Major League Baseball, News, Scores, Highlights, Injuries, Stats, Standings, and Rumors
Boston Red Sox make history with record $170 million ad-patch deal, other teams to follow suit
MLB's new uniform rules won't prevent Red Sox from keeping Boston traditions – Boston Herald
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal
The Future Of Jersey Sponsorships Across US Sports Leagues