Demarini Men's Pyro Long Sleeve Batting Practice Jacket 55% Nylon/45%Polyester Imported Back vents work with your swing to keep you cool and the 1/2 zip opening with a low-profile, no-chafe collar add comfort Water-resistant, wind-proof fabric with lightweight mesh lining Adjustable cuffs and hem at the waist allow you to customize your fit Comes with hand pockets complete with zippers as well as a side zip for easy access on and off