I wear these socks daily, in work boots,in my hiking boots and also inside my morotcycle riding boots. I bought one pair to try - now I have a dozen pairs (different colors). They keep my feet dry, regardless of the weather. I work outside most of the time (Southern Utah) in sand and dirt. It's the only sock I can rely on for comfort, fit and durability. Great prices, too. After 6 years, I still have the first pair I bought, although they are showing signs of wear in the heel. No wool, no cotton...no worries.
The first time I wore these I was in 20-40 degree weather for a 3 day weekend. They kept my feet dry and warm, although at times I did have two pair on for additional comfort. Also, highly recommended for day hiking in spring and summer with warmer temperatures. Feet stay cool and dry.
These are the best socks I have EVER owned. About four years ago I ordered a half dozen pairs of different models of socks that I thought I'd like. These won the mini-competition 'feet' down. I'm sure I'm still wearing the pair from that competition since I have yet to wear any out. When I do, you can bet I'll be buying more of these.