I decided to finally use the great sock yarn I received in my HSKS4 package for a pair of socks for myself. I knew the 100 gram skein I received would not be enough, as I need at least 130 grams to cover my canal boats. So I dug through my stash to find some Patons Kroy sock yarn in black. I cast on using that and did 20 rounds of ribbing before switching to the Hufflpuff yarn.
When I got to the heel flap I used the Kroy again, then switched back once I started the gusset. I split the Hufflepuff yarn into 2 50 gram skeins. I work with that until I run out and then switch to the black for the toe shaping.