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Merino wool is the wool from a merino sheep and known for its high quality wool.
In fact the wool has some special characteristics: - It has antibacertial properties resulting in reduced body odor. I have a couple of merino wool shirts and yes - I can wear them multiple days without problems.
Excellent warmth-to-weight ratio
It retains warmth when wet
However, it is quite expensive and not every wool from a merino sheep is high quality wool (different sheep strains can be bred for meat or wool - but they are not ideal for all purposes at the same time)
If you are interested in more - merino sheep