MLB Men's World Series Therma Base Track Jacket 100% Polyester Imported 100% Polyester Tricot This Long Sleeve, Track Jacket, Has Contrast Raglan Sleeves And Upper Arm Inserts, And Colorblocked Rib At Cuff And Convertible Collar. Features Majestic'S Therma Base Technology For Comfort, Breathability, Insulation And Stretch. Decorated With An Embroiedered, Left Chest World Series Logo And Woven Therma Base Side Seam Label. 100% Polyester Tricot China