These are my everyday wear socks all through the fall, winter, spring. Every day to work. Awesome value and they hold up well. I wouldn't consider them a light sock, more a midweight boot sock. They regulate temp and moisture very well.
As much as I have liked my original Kirkland merino socks, these “newer” models are considerably thicker than the old ones and unfortunately they make my shoes/boots feel a little too snug at times. With that said, they’re still all I wear 95% of the time
I’ve been buying these at Costco for a while. Use them for every day socks in the winter and I get about 2-3 years before the bottom sole wears out. Good while they last though. I’ve used them for hiking/hunting but prefer a tougher sock for that.
I got a dozen of these for a Christmas present 8 or 9 years ago. They have been excellent. I do not think I have worn any out. Bought another dozen last fall...not nearly as good. Still a good buy though. That is the problem with Costco, what you get one time maybe different the next time, although it wears the same label.