However, with the advent of all the miracle wicking fabrics we have today, the problem became simpler. The newer synthetics and merino wool (and wool blends) seem, to me at least, to be effective at regulating temperature over a wider temperature range: a midweight half-zip turtleneck merino wool top now covers the whole range that I used two light wool sweaters (one with and one without a turtleneck, neither zippered) to deal with before. So, we're not needing as many spare pieces, nor are we adding and removing as often as we used to. (At least, that's been my experience.) Different tools, same end result.