I just bought this motorcycle helmet on ebay from a neighbor upstate:
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I'm a retired motorcyclist, so I'm aware of the melon cooker factor. I also know from experience that HJC size L helmets fit my head shape. It should keep me warm through the winter and also be usable in early spring and late fall here. It's a 2-season helmet, here in WI! (winter + 1/2 of spring and 1/2 of fall) Since I'm buying it to use with the eMoped, on which I don't anticipate doing much pedaling, I think the heat factor will be OK.
Lastly, if I add a (ICE) scooter back into the fleet in the future, I'll already have a suitable helmet.

The Yamaha X-Max is catching my eye.
I'll probably add a downhill MTB helmet to the helmet fleet in the late spring to use on the Level.2 and HyperScrambler 2
Edit: Going to have to fit a bar-end mirror on this one, as there are not enough vents to use the aforementioned mirror with. I guess I could take off the face shield, use glasses and use my old Take a Look mirror...