Actually, it's more like the innocuous seams on the socks, but that wouldn't have made as good a title, would it?
I have several pairs of socks that rarely get washed - no, it's not what you're thinking - because they rarely get worn.
The toe seam - I'm sure there's some technical name for that - is ridged. I'll bet you're thinking that's no big deal, but it is to someone whose toes may go in all directions of the compass. A ridge just adds a hurdle in your shoe that your toe(s) need to overcome.
In the future, my sock purchases will be seamless.