Calibrated less for wind blocking and more for light thermal protection, fast wicking and drying on early departing/late returning summer rides. 50+SBF. The Dottore Pro UV Arm Protector benefits from the special blend of our Pinstripe fabric with it’s real silver yarn whose conductive properties allow for better thermoregulation on your body. From the start, you will notice the gentle cooling effect on your skin that continues throughout your ride.