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
Why MassMutual invested in a jersey sponsorship with the Red Sox
Colorful jerseys here to stay: Red Sox president says team not planning future uniform changes, Sports
MLB's new uniform rules won't prevent Red Sox from keeping Boston traditions – Boston Herald
SBJ Closing Bell: Red Sox officially sign MassMutual as patch sponsor
Red Sox, MassMutual near a $17M jersey patch deal - Boston Business Journal
Here are the winners and losers of the baseball offseason - The Boston Globe
Why MassMutual invested in a jersey sponsorship with the Red Sox
MassMutual lands deal for patch on Red Sox uniforms; Springfield company's deal with $17M yearly (report)