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Having cold feet, sometimes even in the summer, I have tried many advertised warm socks including buffalo, marino wool, and alpaca.
These knee high alpaca socks are the warmest of all. Anyone with cold feet will apprecite having socks the warmth these provide.
I wear these knee high socks almost everyday, they are not wearing through or thinning even though the bottom looks lighter, it is solid.
These knee highs fit the bill and I highly recommend them.