Compared to the standard Cloudmonster, the Void’s upper is positioned as more lifestyle-oriented and less performance-driven as expected. However, that shift does not come at the expense of airflow.
In our lab test, the shoe earned a 4/5 in breathability, which we consider the sweet spot for a versatile, year-round option. It provides enough ventilation for warm days without feeling overly airy in cooler conditions, so you do not have to overthink your sock choice.
Ventilation is clearly noticeable in the toebox, where airflow is consistent and effective. On also added 24 fully perforated holes in the tongue, helping keep the instep cool and preventing heat buildup during longer wear.

Under the microscope, the upper left little to criticize. On continues to deliver strong build quality and reliable materials, and that standard is maintained here.

Overall, we see the upper as one of the highlights of the Void, combining comfort, clean aesthetics, and effective ventilation in a well-balanced package.
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