Castelli A/C 3 Cycling Cap Cool head when the thermometer climbs Helmet vents are a mixed blessing in summer heat. They move air, but they also let direct sun bake the top of your head. The A/C 3 sits between your skull and the helmet to fix that problem. The upper is a lightweight polyester mesh that wicks moisture, allows free flow of air, yet provides some sun protection at the same time. A wide, flat stretch band sits comfortably against the skin and blocks perspiration from rolling down, while the paneled design creates a loose, stretchy fit that stays close to the head. The traditional brim lets you shade your eyes or flip it up when the mood strikes. When it's genuinely hot out, this is the cap that stays on. Lightweight mesh upper wicks sweat and keeps airflow moving freely through your helmet vents instead of trapping heat Sun coverage through the vents blocks direct solar exposure on the top of your head without restricting the breathability your helmet already provides Wide flat stretch headband keeps perspiration out of your eyes and sits against the skin without pressure or chafing Traditional paneled construction delivers a snug, low-profile fit that stays put under any helmet without adding bulk | Castelli | A/c 3 Cycling Cap Men's In White | Polyester