i use these base layer pants for $12 from Walmart. No sweat since they wick and keep me warm. I'm a recent wicking convert for T-shirts, sweaters ets. Is all very comfortable. and when washing i notice it comes out of the washer almost dry since it doesn't soak up any water. No more cotton for me.

I also wear them off the bike.

I tried those insulated pants with fleece etc. Problem is cold air still seeps in by the feet because there is a gap between pants and boots. So a baselayer helps with that. This and wool socks.