First thing's first, moisture-wicking socks are not the same as waterproof socks. In the vast majority of cases you don't want fully waterproof socks, because although the may prevent any water from getting in, they similarly prevent any moisture from getting out, so as your feet inevitably sweat throughout the day, that warm, damp, musky sweat will be trapped around your foot until you remove the socks.
What does moisture-wicking mean?
The best moisture-wicking socks are able to repel moisture that tries to get in. They also pull sweat away from your foot and expel it to evaporate, without either trapping it against your foot or soaking it into the sock.
Why does it matter with my socks?
As you might imagine, those warm, damp, sweaty socks are not only uncomfortable, but they are also a breeding ground for odor-causing bacteria.
Do I need it?
If you want your feet to stay drier, fresher, and odor-free throughout the day, then yes you absolutely need to take this into consideration, and the best moisture-wicking socks are made with Merino wool and copper.
Which socks are the best at wicking moisture?
The worst socks for this would be cotton, as they are extremely absorbent and keep your feet damp and sweaty. Merino wool is a natural material that is fantastic for breathability and moisture wicking properties. Copper is known to have a natural ability to fight bacteria and fungus. So the absolute best moisture wicking socks would be a Merino wool blend that also includes copper.