After purchasing a couple of pieces of Icebreaker for my wife, I ended up buying one for myself...the Rock Zip. Needless to say, I now own about six Icebreaker pieces and my wife owns about eight. I can't say enough about the product, it's warm when it needs to be, cool when it requires it, doesn't stink (and let me tell you how great that is!), I haven't had an issue with any shrinkage, but then I wash cold and hang dry just to avoid the possibility. Buy Icebreaker, your wallet will thank you in the long-run!
I purchased this top for my wife and cannot get her to take it off! She hasn't stopped telling her friends about it...it's kind of embarrassing. I heard about merino and thought I'd test it out on my wife first. Low and behold, I've now purchased some Icebreaker for myself based on my wifes reactions. Just buy it, don't think about it.