The Performance(TM) layer when the wind chill isn't a warning, but a calling. The Performance Crew by Coldpruf features a 6.25 oz. 96% CPT Performance Polyester / 4% Spandex Thermal blend that provides a natural stretch and superior fit. Designed to perform in cold to very cold conditions with mid to high activity. Pairs with the Performance Pants. True sizing for an accurate fit. | Coldpruf Performance Crew Thermal Shirt in Black | Size Small