Undyed wool sock yarn 75% wool 25% nylon - The Yarn Gallery

Laines Du Nord Paint Gradient Sock Yarn

Shimmy – Dancing Leaf Farm

Gallery NanoStitch Lab

Undyed natural color yarns for hand dyeing – Merino Textiles

Simply Sock Yarn - Sunset Chroma – Greenwood Fiberworks

All About That Base: Phyllis Sock – Hue Loco

Kleur en Draad Sock yarn – The Mermaid's Purl

About my yarn bases - Little Skein

Undyed - Superwash Merino / Nylon Sock Yarn — Cookston Crafts

Snowdrift yarn - Superwash Merino wool