Yeah, I bought some 150 g/sq m merino polo shirts from Ibex when they were making stuff in the US and I have never worn anything as comfortable in 80F and 90F weather, riding in to work on the bike and around the office. If they were still making them I think I'd buy five more.
And of course when it's cold, I go with thick, long sleeved Ibex jerseys that zip up above my Adam's apple and tuck way down below my waist.

Sadly, Ibex today is not the same company as four years ago.