Every fall on Brussels there's an ad for public bikes. It reads "Ride a bike, it warms you up" (Faites du vélo, ça réchauffe).
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A slogan doesn't make something true.
And more specifically, your torso can be roasting while the freezing wind is giving your face frostbite, and your legs are frigid.
There's a reason why skiers wear face masks and huge goggles and snow pants. Not usually very practical in cities, however.