It seems like there are two major approaches to deep cold footwear: double wool socks inside a felt liner and a wool sock in double felt liners. I stumbled on the former approach on the Lure of the North website and I met someone earlier this month that uses the latter for his near-arctic-circle trips (size 10 feet, size 11 liner inside a size 15wide liner!).
It raised a question for me: At what temperatures does a double sock/double felt liner become necessary/appropriate? (Steiger seems to say a thick wool sock in a 9mm felt liner (with appropriate insoles) is good to about -30/-40dF?)
Any experience with double sock/double felt liner footwear systems? What would be your temperature cut-off for a single sock/liner versus double sock/liner system?
It raised a question for me: At what temperatures does a double sock/double felt liner become necessary/appropriate? (Steiger seems to say a thick wool sock in a 9mm felt liner (with appropriate insoles) is good to about -30/-40dF?)
Any experience with double sock/double felt liner footwear systems? What would be your temperature cut-off for a single sock/liner versus double sock/liner system?
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