Boston Red Sox 'push the envelope' with marathon-inspired blue-yellow uniforms - ESPN
Red Sox unveil yellow jerseys as part of 'City Connect' venture with Nike - The Boston Globe
Official Boston Red Sox Website
Lots of red and blue: Why are the Red Sox wearing their alternate jerseys more often? - The Athletic
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Why the Red Sox are wearing their yellow uniforms
Boston Red Sox uniforms: Why are the Sox wearing yellow and blue jerseys this weekend?