I want to use every bit of it, so I decided to do toe up socks. These aren't my first toe up socks, but since my last pair, I've been converted to using a heel flap. "No problem," I thought to myself. "It's just like knitting my usual top down pair in reverse. I'll just replace the decreases with increases." That was going well until I got to the heel turn. Going top down, decreases help shape the turn. Toe up.... I had no idea.