Patagonia Capilene... Gear review: good stuff.
I grabbed a pair of the base layer pants last fall... put a lot of miles on them biking, and a lot of days wearing them. They show no wear from all winter... and recently pulled them back out of the closet for further testing. Coolest I've ridden in them was 25 degrees...
Wednesday's night ride... 2 hours, at 38 degrees. Wore them under a pair of jeans. Never once was I to hot, or to cold. Best thing... Not sweaty!
As a top I had a thin zip up jersey and a t-shirt, plus a base layer by a bike specific manufacturer, equivelant of a wool sweater, just a little less aerodynamic drag, and a little more wind resistant.
Expensive! But I'd say they are well worth investigating. Flat out puts to shame wool long johns, cotton long johns... and the scratchy polyester cheapos.

Wednesday's night ride... 2 hours, at 38 degrees. Wore them under a pair of jeans. Never once was I to hot, or to cold. Best thing... Not sweaty!
As a top I had a thin zip up jersey and a t-shirt, plus a base layer by a bike specific manufacturer, equivelant of a wool sweater, just a little less aerodynamic drag, and a little more wind resistant.
Expensive! But I'd say they are well worth investigating. Flat out puts to shame wool long johns, cotton long johns... and the scratchy polyester cheapos.