MLB Boston Red Sox Therma Base Track Jacket 100% Polyester Imported This zip-front track jacket features a left chest self-fabric applique, authentic logo and a center back neck embroidered MLB silhouetted batter patch. Added comfort features of rib knit collar, cuffs & waistband, along with Therma Base Technology, will keep you warm & dry. Officially licensed by Major League Baseball. Available in Official team colors and logos. Made of 100% polyester tricot, 270gsm.