This is a chain plyed BFL dyed by Spunky Electric that I spun up last year. It knit up so nicely for these socks. I used my toe up recipe and did an interesting pattern on the instep and legs.
It's a K2P2 rib for 3 rows and then 2 rows of plain knit - repeated
This gave an interesting texture to the socks and made them very stretchy - I didn't get a close up of the pattern, but should have.