This is way cheaper than the Injinjis and the quality is good.  I wear a 7 - 8US women's size shoe and this sock fits me perfectly.  The color is great as well.  It is a good traveling sock.  In fact I wore it on a long haul travel from Chicago to Sydney, Australia and vice-versa; very comfortable and didn't experience any swollen feet during the long flight.  I gave a pair to my brothers and it fit them well too.  Their feet size is an inch or 2 bigger than mine and with wider feet.