These are my favorite hiking socks and they are so durable that I only have / need 2 pairs. These are great because they are:
Versatile: I wear these all the time except for winter 14er / White Mountain trips and any time I go over 5000m (so far my 5000m hikes have been night ascents). I've worn these for about a week without any issues.
Fast drying and hike well when wet: I've hiked through lots of water with these (Zion Narrows, Pacific Ocean, etc.) and they've been great when wet, have dried fast and remained comfortable.
Comfortable: I never wear liners with these and don't get blisters. These socks do seem to have more air / cushioning (less 'dense') than regular cotton socks.
Easy to maintain: What really won me over with SmartWools over Thorlos is that you don't have to use fabric softeners with these. I used to wear Thorlos only and purchased fabric softener for the socks after trying it without a few times. Then I got my 1st pair free from SmartWool and I've been hooked ever since.
Too thin for serious hiking, backpacking, or peak bagging. They may be ok for short day hikes or similar outings but I do not recommend them for backpacking or other more serious outings. I wear them to work instead.
Love these socks, I own many pairs. They hold up well over years of use. I wear them in summer and winter. I like the light-hiking weight in the summertime and the hiking in the wintertime. They don't go on sale very often, but every once in a while they do, and then I snatch up a pair or two!