First impression: very positive. The cap is lightweight, feels comfortable and (what I like) is already higher than your ears and mind well into the neck.
Apart from the sample wearing a helmet, which fitted well within the settings of my helmet, I can not report any of Raderfahrungen or fast descents. But: The cap is also reflected off of the wheel well! During a stay in the windy Iceland I wore the hat almost permanently - my other hats were too thick / warm forehead hood probably an exaggeration, but the bike Cap was optimal for me. Even the sweaty Fleece warmed still good and protected from the wind, even if not all wind ichtes material was installed.
With the experience gained so far, I can well imagine, to wear the cap under the climbing helmet. In winter I am looking forward to your head warm while cycling. And wash the cap also read several times and without any problems. All good so.
