2021 Chicago White Sox Martyl Reinsdorf MR Commemorative patch

The White Sox added the commemorative patch featuring the initials "MR" scripted in white on a black oval in memory of Martyl Reinsdorf, the wife of White Sox team chairman Jerry Reinsdorf. The patch features 16 small white circles within the oval on either side of the initials with two large white bands along the top and bottom.

Reinsdorf, who died on June 28th at the age of 85, was more than the wife of the team's owner, she also designed the White Sox 2005 World Series championship rings as well as the championship rings for 5 of the 6 Chicago Bulls NBA Championships in the 1990s.
The White Sox will continue to wear the  "MR" patch on all of their jersey sleeves for the remainder of the 2021 season in honour of Martyl Reinsdorf.