With a throwback Sosa jersey from Clark Street Sports you'll always be ready to go yard. This Nike Sammy Sosa Chicago Cubs Home Jersey is authentic down to the last detail: the white base with blue pinstripes the Cubs Bullseye logo on the left chest and Sosa's famous #21 on the back. It's officially licensed MLB apparel made of 100% polyester material that keeps you cool and dry. Head for Wrigley Field or relax on the couch in our men's replica Sammy Sosa jersey.100% PolyesterBy NikeOfficially licensed