Tried out my silk baselayer today - just under an alert shirt nothing more. Wanted to see how it breathed and all. Perhaps it was a little too warm for this test. Silk is warmer than my polyester base layers. And it wicks quite well - which is a darn good thing but it was too warm for this test to today. Did I mention that silk is warm?

OTOH - wind goes right through it so when using my silks I will need a wind barrier ...