I tried lightweight socks on my most recent backpacking trip and really liked them. I’ve been wearing thick wool socks for backpacking since the 1970’s. I stopped using liner socks a decade or two ago, but I had never tried lighter main socks like the thru-hikers wear now.
The forecast was for continuous soaking rain, 48º temperatures, some steep trails, and a fair amount of idle time waiting for the next participant patrol to come to my area. That’s a good sock test, with a nice chance to have cold, wet feet, plus blisters. But less sock means less wet sock, right? And if I get a blister on a two-night outing, I can deal with that.
I grabbed some light socks at REI, Wigwam Merino Airlite Pro. They are roughly one third each of merino wool, stretch nylon, and polyester, plus a smudge of cotton. There is no cushioning, just a nice smooth fit.
Here they are with my previous socks, SmartWool Trekking, 77% merino wool and probably one of the heavier socks you can find.