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> Pedaling warms the user, making electric heating in winter unnecessary

Well that's one way to spin a missing feature ;)

Too bad it doesn't really work. Winter biking is still cold as shit and breathing in -20°C air is not fun.

Not in a Velomobile. Actually, you need a fan for forced ventilation.

Or to ride semi-naked. Now there's a sight for winter.

That hasn't been my experience. One the airstream is blocked you won't be cold for long.