Originally Posted by
DrIsotope
This could only happen if you were traveling at sufficient speed (that is, +20mph,) with temperatures below 40ºF, and a suitable range of humidity. Frost above ambient freezing is a result of wind chill.
All of these conditions could be met with tights. Knee warmers provide absolutely no advantages in performance or convenience.
In this case, you are apparently so fast you need to have de-icing equipment installed, like aircraft.
Yes. Exactly those conditions. Frost on extremities due to wind chill, but because of the metabolic effort the core is quite warm and a double layer (tights over bibs) is uncomfortable. To me at least. But yes, you've perfectly described the conditions I'm talking about, which are very common in NorCal during the winter.