This baselayer thermal top offers the best in thermal apparel, made of lightweight polyester interlock fabric for flexibility and durability, allowing for stretch and mobility that enables you to take on any vigorous outdoor activity. Perfect for layering, this fitted thermal top acts as a protective baselayer that creates a barrier to keep heat locked in for extra warmth and comfort. This performance thermal top helps you fend off the cold by trapping in heat and have a snug fit around the ankles to keep the cold air from entering. Its moisture-wicking technology helps you stay dry and comfortable while the odor resisting feature helps you avoid any funky odors.