Hemşin (HEM-sheen) is a village - actually two different villages with people of the same ethnic origin - in Turkey's E. Black Sea region. I first saw a similar sock to this on a friend whose mother had knitted it for him.
I'd started this sock before but wasn't liking the yarn -too splitty and fuzzy. So I pulled out the needles and started over, this time with a nice dark teal yarn and an almost-white for the pattern. I'll have to get the original sock in front of me to analyze the heel though.
You can see where the white was being knitted a bit tight (Englisg style) at first but it's mostly okay now. Photos coming.
The striped bottom (and various variations) are very common in Turkey village socks. In addition to the aesthetic side, it also creates a sturdier fabric since you get a very equal distribution of the two colors on the back.