DeMarini Men's Demarini Short Sleeved Performance Baseball Team Shirt 91% Polyester 91% Polyester; 9% Spandex; Machine Washable The comfort-fit design of DeMarini's team shirt is built to be worn under your game jersey or as a workout shirt. It is custom fitted so that your team shirt is not too tight or too baggy. Body-mapping mesh inserts provide breathability and the body fabric stretches in all directions to allow a full range of motion. Vietnam