So far, I've only used them in S. Texas. Bought them for Alaskan winter, and will update with info for warmth soon.
So far, they have been SO comfortable and keep my feet from overheating when it's hot outside, but have kept them perfectly warm when it's gotten cold. These are the only socks I've ever been able to sleep in without feeling like my feet are suffocating.
Will update with warmth rating when I get back to AK.

I bought several pairs for my friend in Canada. She needed wool socks in my opinion, but couldn't wear them as wool always made her "itch". I bought these and thought that she could wear cotton socks under them - but she didn't need to - and she's crazy about their warmth and comfort. Since she gave half of the order to her daughter I'm now buying more for both of them!

I sent two pair of these socks to a friend in Canada who was afraid to buy them because she'd always had an "itch reaction" to wool. No, these won't make you itch. They're very comfortable and I have since ordered four more pair.

Ive used these socks for years. They are not the most "high volume" full cushion boot sock and you need to make sure you buy the right size (too small would be uncomfortable). Hands down the most durable, comfortable sock ever. I have pairs that are about 3 years old and I still wear them daily...On top of it all, they are from Vermont, and Vermont rocks.

plain & simple i wear brashers all wool Hill Walkers/Hikers...so tried these thinking "No WAY"...as with almost all my gear that got the airport/city/train/wandering everywhere break in...concrete pure & simple with hills!...ok...while i still love my heavyweight brashers, these really did the juob...my Teva sandals...my Salomon GTX boots...everywhere...they'll soon get a trail run as well...nice pair of socks (no burns, comfortable, got wet/stayed warm, held up thru wash, and i tried them w/wo Bridgedale liners (another story their great too) and they were 8.5 outta 10)...and i'm a 6'1", 210#, freckeled redhead with near extreme high arch and very sensitive skin). In EBay terms A++++++++++++++

Bought my husband these socks and a pair of Scarpas Boots. He loved both! During the 7-mile hike, I asked him how he liked the socks. He said, "oh, I didn't have to think about my feet, so that's a great thing because if I have to think about my feet, that means there's something wrong with my socks." He loves it! It kept him warm, comfortable, and after going through the laundry, it held its shape and didn't even shrink. Great pair of socks! I'm going to have to get a pair for myself right now...

In all honesty, they are not as heavyweight/thick as I was hoping they'd be. With that said, they are extremely comfortable and keep the feet warm. Don't know if they're worth the price tag.

These socks are definitely comfortable but I didn't find them to be comfortable for hiking. My feet were more sore after wearing these socks than they typically are after a long day of hiking.

These are great socks. Have used Smartwool, Teko and Darn Tough for trekking and I have to say that I am still deciding wich ones I like better. They are all great. Not as much cushion as on the expedition weight smartwools but very very nice and comfortable. These darn tough are a great product.

These socks are spectacular. I have two pairs of them and will never buy another brand/type of hiking sock. They are extremely comfortable, have JUST the right thickness in ALL of the right places, and do an awesome job at keeping moisture away from your feet. Also, these socks come with a liftetime warranty. You won't regret the money you spend on these socks!!

Like them better than my smart wool brand. for whatever reason they are more comfortable.

These socks are great so far... Just took a couple pairs out for a week of hiking... They did the job just fine, and any discomfort in my feet I would certainly accredit to my less than great hiking boots... But these socks made the most of it, I wish I had bought all of this sock, and not tried others.

What can I say. After a whole day in my Lowa Trekkers (in 100 deg. weather) my feet felt as fresh as when I'd put the boots on that morning. These are simply marvelous at wicking moisture away from your feet. The fit is superb and they don't shift and bunch up like cotton socks. I bought a couple more pairs just in case they ever stop making them. Simply outstanding! AAA+++

These socks are great! I never knew my feet could be so comfortable. I took them camping, and when I left my Keen sandals out in the rain (yikes), I grabbed my darn tough socks. My feet stayed comfy all day. The wool wicked away the moisture from the sandals and the cushioning prevented slipping around in the wet shoe. These socks really hug the foot and stay in place.

Nothing comes close

Super comfy but really weak. Heels rip out before your boots start to stink..

I love these socks. They are the perfect weight. I wear them ice skating and they keep my feet nice and warm.

I used these for a seven day hiking trip in Russia, and a quite strenuous one. I used the socks with CoolMax liner socks, and I came home without even a hint of a blister, which is quite amazing to me. So I definitely recommend these socks!