Sizing POC Ventral Air SPIN

I’m considering a POC Ventral Air SPIN helmet. My head sizes 61 cm and the biggest size L goes from 59 - 61 cm. Would this still allow to wear a cap below it in cold weather? I prefer POC because of the fit and the good ventilation but the sizing of the 2 Octals that I had went up to 62 cm. That type is not available anymore unfortunately.