It's toe up using a short row toe and short row heel. Both are double wrapped, so there are no holes. I can't remember where I got the no holes recipe from. I just did this from memory.
The rest of the sock is plain stockinette with extra long ribbing at the top.
I used this sock as a good excuse to learn a new cast off technique. I used Elizabeth Zimmermann's stretchy bind off. It was really easy, and I am extremely pleased with the result.
I am hard at work on the mate for this sock.
Oh, before I forget ---- The yarn is Austermann Step in color #21.