Oooh, I know what you mean, but that is where the very light weight 17.5 merino wool comes in. I am finding even on warm days my kates are fine (cuz there is still air conditioning inside) and I also picked up some of those nice polos that are still on sale in the ibex outlet section. But I know what you mean, there is something about having to take my shak off when it warms up that is, shall we say, *disturbing*.
I am also finding that I am using my ibex cycling cap and glove liners in unexpected ways. With our strange temps here, cold in am and warm in pm, I do put them on when I drive to work in the cold (our car heater is dead), and then stuff them in a pocket for the ride home. Less bulky to store than my regular winter hat and gloves, but a welcome extra layer for a chilly car ride. Also nice to have stuffed in the pocket of my rain shell, just in case.......
I am curious how long I can keep wearing wool, but the polo shirts are so light weight, I don't see why I can't wear them even into summer. What folks don't get that never saw this fabric is that to me it is like a silk/cotton blend in texture, and so breathable that it really should work even in summer. We'll see.........