If you prefer the look and under-helmet feel of paneled cycling cap, but would prefer to eschew the traditional cotton material of the past, the Castelli Rosso Cap with a 100% polyester construction offers a softer feel against the skin and maximum wicking capability for all around comfort in mildly cool or warm weather rides. The cap fits sleekly and fits properly under a helmet. The flexible brim can be worn up or down and has the proper length for some sun protection without negatively impacting your viewing angle in a semi-aggressive riding posture. The fabric and headband offer adequate stretch to fit a rage of head sizes and hair volumes. The thin stripe patterns of the subtly distinctive color options adds color contrasts and an aesthetic sense of motion.