100% merino doesn't seem to mean it's great though. I've got a cheapo uniqlo merino sweater that doesn't let sweat pass through anywhere near as good as my chocolate fish one. Not that I expected it too, but worth noting that just cause it's 100% doesn't mean it's great
Just found a review here:
http://road.cc/content/review/25150-dhb-merino-long-sleeve-zipneck-base-layer