Men's Merino Wool Socks

Merino socks are named for a fiber rather than for a height, and that fiber is graded in microns, thousandths of a millimeter. Wool measuring under about 19 microns bends when it meets skin instead of poking it. Merino does not prickle where coarse wool does. Fineness is the reason this one can be worn on bare feet all day.

Two behaviors follow from the fiber's structure. Merino takes up to 30 percent of its weight in moisture as vapor into the core of each strand while the outer surface still feels dry. Skin stays comfortable well past the point where cotton would be soaked. The same wool holds odor compounds inside itself and out of reach of the bacteria living on the surface. This is what lets a pair go two or three days between washes. Almost none are pure wool, because wool alone opens at the heel; expect 60 to 80 percent merino with 15 to 30 percent nylon and 2 to 5 percent elastane.

Bulk and height define Boot Socks, which are usually knitted from this same fiber. Athletic Socks in polyester dry faster after a soaking and cost a third as much, at the price of smelling by the end of a session. Dress Socks come in fine merino too, spun thin, and that version is what makes a suit comfortable in February.

Travel is where the money comes back, since four pairs cover two weeks. Cold and wet conditions are the other clear case, because wool insulates when damp and cotton stops working entirely. Anyone who overheats inside a shoe gains year round. Paying for it stings in three places: three to five times the price of a cotton pair, heels that wear faster than in a nylon-heavy sock, and untreated wool that felts in a hot wash. This means the scales along each fiber lock together and the sock shrinks for good.

Read the percentage every time, since a sock advertised as merino with no number attached is often mostly acrylic carrying a token amount of wool. Superwash on the label means those scales have been smoothed or coated so the pair survives a machine, and its absence means hand washing. Confirm the heel and toe are nylon reinforced. Wash cool, skip the dryer, and store summer stock clean, because moths feed on the residue in worn wool rather than on the wool itself.