Read the percentage beside the fiber
The current Darn Tough 1466 label lists 61% merino, 36% nylon and 3% Lycra. Farm to Feet Damascus lists 51% merino, 46% nylon and 3% Lycra. Both are described as merino hiking socks, but neither is a 100% wool sock.
Check what “100%” modifies
A statement about 100% US-grown merino can describe where the wool portion comes from. It does not erase the nylon or elastic fibers elsewhere in the blend. Read the sentence together with the complete materials label.
Do not rank the blend by wool alone
Wool percentage does not establish warmth, drying time, softness or lifespan. The amount and location of cushioning, yarn/knit construction and the fit of the exact size also change what you are comparing.
If pure wool is your requirement
Look for an exact current model whose complete label confirms that requirement. This initial catalog does not establish a 100% wool hiking model. It is more useful to state that gap than substitute a wool blend or an unavailable product.
Keep the rest of the decision
Even a complete fiber label leaves height, size, cushion and care to check. Use a model profile to keep those facts together. If a fiber label changes by market or UPC, keep that distinction instead of combining the figures.