For heavy sweaters, or riders who wish mountain bike helmets provided more ventilation, the Caipi half shell from Kask was designed with maximum airflow in mind. The light 250g (size M) lid is a featherweight sibling of the brand’s more gravity focused Rex helmet. Shaped with XC or “trail” shredding and gravel grinding in mind, it might be better described as a robust road helmet with a visor than a mountain bike helmet.

Each of the Caipi shell’s 22 vents is connected by a channel in the inner foam layer to provide maximum airflow throughout. The ports beneath the visor are shaped to force air into and through the shell, and when you’re moving it feels a little like a built-in hairdryer set to “cool” mode. The Caipi is the most well vented and breathable helmet I have tested in a few years, and it will be a perfect lid for hot rides. The low weight and breathability also make it a smart option for bikepacking trips where it will eventually end up strapped to the bike that is on my shoulders through hike-a-bike excursions.

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