The SPF30 Ultralight™ cap shields you from the sun, effectively wicks away sweat, and features a sun protection factor of 30, providing extra skin protection on summer days. This cap is designed to be worn under a helmet, making it thin enough to sit without wrinkles and so light that you'll practically forget you're wearing it once it's on. Additionally, compared to other caps, we have reduced the brim size to ensure better all-around visibility with a hood or during downhill rides.