I sweat from my head, a lot and in all weather. I can't wear anything that completely blocks ventilation and seals in the sweat.

I have a winter-weight cycling skullcap, and a choice of balaclavas to wear in winter.

My Giro Ionos helmet (not the one in the avatar) came with a cold-weather insert. You remove the pads and put the insert in their place.

I can usually find the right balance of insulation and ventilation.