Introducing the collaboration between New Era and Polartec. Each cap features Polartec material paired with a grey undervisor and a discreet Polartec tag sewn in where the crown and visor meet. We've got fitteds from the Yankees, Dodgers and White Sox. Crafted in all-over Polartec Sherpa fleece, The Polartec Collection is first class in equipping you for cold weather. Polartec® Wind Pro® is an advanced fleece developed to resist more than just the cold. While still air permeable, a tighter knit construction reduces the amount of wind chill, and a durable water repellent outer surface withstands moisture and rain while retaining breathability and comfort.