I buy these for my husband. He's a Railroad Freight Conductor and requires a good, and long-lasting (durable), sock.
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WEATHER

They are excellent for Spring and Autumn weather only. With only 17% Wool, they keep the chill off one's feet, but will not keep that 'cold-to-the-bone' at bay. For that, you need to get the Carhartt 'Arctic' socks, (37% Wool)*** (See 'EDIT' below).
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LENGTH & DURABILITY

They are 'Boot Length', (which means 'just-over-the-calf'), Wear well, and Wash well. No pilling. And, being just-over-the-calf, they stay up... which is good news for boot wearers.
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SIZING

The Sizing was a bit of a problem. My husband wears a 10 1/2 boot, so, you would think he'd take the large-size sock that supposedly fits a 10-12 shoe. Wrong. We found that the socks were too tight both in the feet and in the calf, and sent them back in exchange for the Extra-Large, (fitting shoe size 12-15), and those fit him perfectly. No tightness whatsoever... just a very nice fit that gives good support as well.
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THE 'FEEL'

They have no Toe-seams, are totally Re-inforced, and are so Soft & Cushy in the Toe and Heel. He says he even feels support in his Arch... a good thing for a man who is setting out cars and walking those tracks at all hours of the day and night.
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SUMMARY

My husband is very pleased with these socks, and so am I. It seemed to take forever to find the right kind of sock for him-- Weather-wise, Fit-wise, and Quality-wise; but after many trials and errors, we finally found his 'holy grail' of Spring/Autumn-weather work socks.

Go get 'em... you'll be glad you did.

***EDIT: DECEMBER 8-2011: I just found these other Carhartt socks, 'Carhartt Men's Artic Wool Heavy Boot Socks'. With 87% Wool, my husband says these are the bomb for Winter Weather, far exceeding the 37% Wool of the 'Carhartt Extremes Wool Arctic Boot Sock' I mentioned above. Take as look...&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Carhartt-Men-s-Artic-Wool-Heavy-Boot-Socks/dp/B0051U15IU/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Carhartt Men's Artic Wool Heavy Boot Socks</a>