Thank you for viewing. This is a jumper/jacket from the Saitama Seibu Lions. Size is M. It has been used, but is still wearable! My son played for the ◯◯ Lions in youth baseball, so I bought and wore this Lions gear to cheer him on, but I'm selling it now that he's graduated! The inside is mesh. It's unclear whether this is official support merchandise, and it feels like a staff jumper, but it's unknown. Fans might know more! For Seibu Lions fans and those of the ◯◯ Lions teams nationwide, thank you! Please understand that this has been stored by a private individual.