A black helmet isn't really any hotter; pros are just racing with their typical helmet. The foam in a helmet is such a good insulator (basically a beer cooler) that there is negligible conductive heat transfer between the inside and outside of the helmet. What matters is convective transfer (i.e. airflow inside the helmet...i.e. ventilation).

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

Ventilation is way more important than color in regards to heat