From the Etsy listing:
This sock pattern is the new favorite of all my test knitters. It works great for all types of sock yarn, from solid to self patterning. It has an easily memorized repeat for those that like to take their sock knitting on the road with them.

Difficulty: Intermediate (but easy for previous sock knitters)
Size: Two sizes - 7” or 8” diameter
Gauge: 32 or 36 sts per 4 inch