What's the difference between sock yarn and fingering weight yarn? Technically not much. They are both a lighter weight yarn yet can vary greatly in thickness. (see the Craft Yarn council for their standard measurements: https://www.craftyarncouncil.com/standards/yarn-weight-system) Many times an indie dyer and commercial yarn makers will make sock yarn in variegated colors and make solid colors and just call them fingering. Sometimes not. There’s so much variation between companies that there really is no standard. You can always use a WPI tool (https://woolery.com/wpi-tool.html) to find your gauge or just swatch swatch swatch. But just know that they are close enough in weight to each other but vary wildly in color. Here's a selection of variegated and solid that could be used for socks, shawls or the yoke of a sweater. There's something here for everyone, ENJOY!