The Polartec® Power Stretch® Pro™ fabrics have a 4-way elasticity that wraps the body while maintaining the capacity to breathe. They keep you dry when you sweat and provide warmth without weight. These fabrics feature a proprietary construction with two unique surfaces: a durable nylon outer layer is wind and abrasion resistant; the soft polyester inner layer pulls moisture away from your skin keeping you dry, warm and comfortable. Adaptable to changing weather conditions, Polartec® Power Stretch® Pro™ garments make an excellent base layer and can be layered over lighter garments, or serve as warm, durable outerwear.