Calibrated for light thermal protection, smart thermoregulation and fast wicking and drying on summer rides with variable conditions, the Dottore Pro UV Arm Protector features a 50+ SPF UV protection rating making them exceptionally useful also in extreme heat. The Dottore Pro UV Arm Protector in fact benefits from the use of real silver yarn whose conductive properties allow for better thermoregulation on your body. From the start, you will notice the gentle cooling or warming effect on your skin (depending on local temperatures) that continues throughout your ride.