The first part of this pattern ( heel ) is worked flat then seamed up the back. The foot and toes are worked in the round. I went with 2 strains held together through out.
I used the magic loop method for this pattern. The cuff is optional, pattern works quite well without it.
I got the idea for these from a really nice book Socks, Socks, Socks. They have a very pretty lacy pattern for ladies slippers called S.O.S. They use the flat knit heel and in the round for the rest of the foot technique.