MLB Boston Red Sox Granite Road Therma Base Premier Jacket Olympic collar; Banded cuffs and waistband, colorblocked inserts. Therma Base technology keeps you warm and dry - wind & water proof. Polyester-spandex blend for maximum durability, four way stretch and superior comfort Available in Pro Granite/Team Colors. Officially licensed by MLB 150 Gsm, 88% / 12% - Polyester/Spandex