Please excuse the dumb question…but what is sock yarn?
It’s a particular type of yarn made specifically for socks that is smaller than sport weight, but larger than lace weight. Usually it’s a blend containing a small bit of nylon for elasticity, and preferably machine washable and dryable. It’s just the ideal yarn for knitting socks.
What brand do you use?
I use several different brands, but some of my favorites are Jawoll Lang, Regia, Sockotta, Lornas Laces, Cascade Fixation and Knit Picks’ Bare Superwash/Nylon blend.