I almost returned them, I am a man size 12W.  I did not return them because this winter hit hard and fast and I really needed them, having just moved.  However, they are a tad too tight for my calves and feet.  I think they'd be great for a size 11.5 or smaller.  They seem well made, but shouldn't be advertised as being okay for size 12, because they're a tad too tight for 12.