It's their City Connect uni, honoring the Boston Marathon.
https://www.mlb.com/news/red-sox-release-patriots-day-inspired-city-connect-uniforms
I hate most, if not all, of the City Connect unis.
Eh - it was a beautiful day! Way too many people there, but great weather.
I checked the team store and the Mitchell & Ness kiosk - no gray road jerseys. I don't get it, but they seem to have disappeared. I'll keep checking.
Shade is very important! I always try to get seats in the shade, although that's a tough one in a single-deck stadium.
Glad you had a good time and hope you go again. The season is just beginning!
Haven't been to the one in Clearwater, but the original Columbia in Ybor City is incredible! We usually stop there for lunch on our way to the airport when we leave. Someday, we will do that again...