I've always looked to Helly Hansen for my thermals. Have had one of their Merino wool 1/2 zip tops for a while and it's seen a lot of use on the bike, kayaking and running, so decided to try these.
Not disappointed. Nice and warm. Does not feel itchy/scratchy at all for me - in fact it's probably one of my most comfortable pair of thermals. Would probably keep them reserved for the winter though. The fly is always a plus too!