Marmot is the best!
I got the Silkweight Crew for my husband for Christmas and he was so excited. He's had a lightweight Marmot crew for like 8 years and he finally wore it out, mainly because it was a size too small. Now he has one that fits properly and he wears it as his base layer on all of his outdoor gigs, and cold days in general. The Silkweight is very comfortable.