first hand experience today with this exact question. started my round with the short sleeve FJ windshirt when allowed my body to breath and not cause me to sweat too much and still kept the cool wind away from my body. after finishing golf today, went shopping and threw on a sleeveless gore tex wind shirt I had in the trunk of the car, by the time I finished my running around I was sweating and the heat was being kept in by the gore tex shirt versus.
Winner winner chicken dinner -- DryJoy windshirt