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I am all for Merino Wool socks, they are the best socks you can buy. Some people prefer SmartWool, some are not picky. I love my Darn Toughs. Made in VT, and I use them in VT.
I have worn these for over a year as my primary ski socks. They show no sign of thinning in the heels, where my old Columbia ski socks wore through.
Are they better than Smart Wool? Both are awesome products, neither is better in my opinion. I like to support Vermont companies so Darn Tough gets my vote, although I have a dozen pairs of Smart Wool socks. I will say that since I have started wearing my DT's in my new Atomic boots, I have never had to dry them (the boots) after a day of skiing. I have always had super sweaty / wet liners after skiing in every other boot and/or sock.
If you are in need of new ski socks, pick up a pair of DT's. As a rule of thumb, always get fitted for new boots with an ultra thin sock. That way you will have a "perfect" fit and can switch to a light or cushion sock after the liners begin to pack out.