> Those merino boxers you linked to aren't cycling nicks, they're just underwear. You'd still have to wear somethign over the top of them. If you're spending any time in the saddle I'd suggest a proper pair of cycling nicks - with a chamois. That said, I got some cheap merino thermals at Aldi, and they're great. Warm in the wet, but not sweaty like lycra. You can even machine wash them.
I accept this comment, to get this question away from unanswered list. I will remove this if the original commenter makes the comment as answer. I think the comment/answer is good because it cuts the marketing facade into issues such as proper pair of cycling nicks (with a chamois) and machine-washing -- and needless to get some XYZ -branded merino [wf]-ools, even discounters offer proper ones.