When casting on for a cuff down sock I prefer to work 1 row flat before joining to work in the round - to reduce the risk of accidental twisting. Using long tailed cast on, cast on 64 st onto your circular needle.
Set-up: k1tbl, p1 to end.
Join to work in round, being careful not to twist and place marker to indicate beginning of round. Work in twisted rib (K1tbl, p1) to end, until cuff measures 1.5” from cast on edge.
For the original Bob sock I knit the first and last 4 stitches of each needle in twisted rib - for this second version I chose to work them in garter stitch - you can of course just knit these plain if you prefer.
Leg: Ribbed panel option
N1: (k1tbl, p1) x 2, k24, (k1tbl, p1) x 2 N2: repeat as for N1
Work each rnd exactly the same until cuff measures 7” (or desired length) from cast on edge/
Leg: Garter panel option
Rnd 1 N1: p4, k24, p4 N2: repeat as for N1
Rnd 2 N1: k all st N2: repeat as for N1
Repeat these two rounds until cuff measures 7" from cast on edge.