THE SPF ULTRALIGHT CAP PROVIDES A BIT OF SHADE FROM THE SUN, WITH GREAT SWEAT-WICKING PERFORMANCE AND AN SPF RATING OF 30, SO YOU CAN RIDE ON SUMMER DAYS WITH A LITTLE EXTRA SKIN PROTECTION. Designed to be worn under a helmet, it is thin enough to fit without bunching and light enough to practically disappear when you put it on. We've also shortened the brim for better upper peripheral vision when on the hoods or in the drops.