Each year on April 15th, Major League Baseball celebrates Jackie Robinson Day, a tribute to the man who broke the color barrier and paved the way for generations of players. Honor a baseball icon and your Boston Red Sox with this 2026 Jackie Robinson Day 39THIRTY M-Crown Flex Hat from New Era. Engineered for a snug, premier fit, this piece provides all-day comfort. With raised, embroidered graphics, this flex fit is a superb way to express your Boston Red Sox devotion. Its M-Crown design sits higher than the original 39THIRTY fit, while the sublimated "42" on the underbill tributes a baseball legend.