I have had a problem with very sweaty feet and foot odor for YEARS. I mean sweat like you could ring drips out of my socks and odor that physically hurts. Ive changed a few things that helped the smell only a little but thankfully on a whim I purchased these socks. Im dubious about the copper, Im pretty sure they were woven from unicorn hair, becausethese are never soaked and my feet smell like an average human at the end of the day. I plan to slowly switch out my entire sock wardrobe. Im a size 6.5 womens shoe and they're a little large on me but I do not care.