just so you all know, it's 75 degrees in SoCal today...
but on those days when it's really "cold" here, i do use defeet knee warmers and they work great. knee warmers first, then shorts. then again, i do make sure the bottom cuff is above the calf. that might have a little do with why they stay up.
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"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo daVinci