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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

Now, my husband has the 37%-Wool Carhartt Men's EXTREMES WOOL ARTIC Boot Sock (for Winter). As they are now unavailable, I can't post a link to them.

AND, he has the 17%-Wool Carhartt Men's EXTREMES COLD WEATHER Boot Sock (for Spring and Autumn).&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Carhartt-Men-s-Extremes-Cold-Weather-Boot-Sock/dp/B00408936A/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Carhartt Men's Extremes Cold Weather Boot Sock</a>

BUT, when Carhartt came out with these 87%-Wool Carhartt MEN'S ARTIC WOOL HEAVY BOOT SOCKS , well, that was it. I bought my husband 10-pair and he's in absolute heaven. These socks, in his words, are 'Roasty-Toasty', and that's just the way he likes his tootsies, *vvvbs*
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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. (He is not overweight at all, nor does he suffer from over-large calves or ankles... he's 6' and weighs 200lbs)
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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 FREEZING-COLD 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 Winter-weather work socks. 87%-WOOL!

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