UltraClub womens Platinum Performance Jacquard Polo with TC Tech (8320L) 100% micro-polyester 100% micro-polyester Revolutionary new fabric that cools your body when hot, and warms you when cold. Coordinate: Men's 8320 100% micro-polyester 4.9-oz. TempControl technology features specially treated quick-dry fibers to rapidly wick moisture away from skin and keep you warm or cool