I love those Costco merino socks. I wear them all winter and into Spring. They seem to last forever, too. I may buy another pack of them this year, but my older ones are fine even though the first pack I bought and still wear is at least six years old.
THE warmest socks, gloves, and hats are Heat Holders. By far the best. Not cheap, but man oh man are they warm.
LINK
