If you mean Kevin Youkilis, he wears the number 20
Pitcher Jon Lester wears #31 for the Red Sox.
Trot Nixon used to wear #4 for the Boston Red Sox but he was traded to the Indians, so no one currently wears #4 for the Boston Red Sox.
David "Big Papi" Ortiz wears number 34 for the Boston Red Sox.
Nobody on the Red Sox active roster wears # 43 in 2009.
Currently, no player wears #26 for the Boston Red Sox.
Mike Timlin wears the number 50 for the Red Sox.
Jacoby Ellsbury wears 46 for the Red Sox now.
He wears a Red Sox hat because he is an avid Sox fan. I've seen him at games before.
No one currently wears the number 26 on the Red Sox, however former Red Sox great Wade Boggs wore number 26.
Remy wore # 2 for the Red Sox.
80% Yankees and 20% Red Sox
Mike Ryba, a pitcher, wore #20 for the Red Sox between 1942-1946.
Jason Bay, 2009 Number 44
No he is a sox fan he just wears Yankees hats to make him look more 'gangster'
Ryan Lavarnway is number 20 on the Boston Red Sox.
Curt Schilling, pitcher for the Boston Red Sox.
Manny Delcarmen during years 2007-09
It would appear that the reason why Jeremy Kapstein wears headphones at the Red Sox's games is a very straightforward one. Apparently it is because it is his job to do so.
Daisuke Matsuzaka currently wears # 18 for the Red Sox, Jason Kendall the catcher for the Brewers also wears the number.