I've abandoned SmartWool liner socks which I think are 70/30 wool/nylon. They just don't last and they cost $13!! Instead I found 4 pairs of older style 60/40 wool nylon "dress" socks at Value Village for $3 and snapped them all up. For around the same price as one pair of SmartWool, I shall be hiking for at least four seasons on these babies. Maybe even longer!! I would stay away from any soft wool and merino in favour of blends of nylon and wool that are tough and dry more quickly. These ones I just got are perfect, a little thicker weave than SmartWool liners but not as thick as a few others I've tried so perfect for three season use. I just put on the second pair if it gets cold, as they weigh nothing and I can easily carry three pairs.

Never had a regular blister while using these style of stocks but I did have one under my heal after 30 miles once from the pounding.
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Listen to the trees in the wind