Using larger needles and MC, CO 50[58] sts. Divide evenly between 3 needles and join to begin working in the round, being careful not to twist.

Work in 1x1 Rib until work measures 14 inches.

P 1 round.

Next Round: Using smaller needles, [k3[2], k2tog] 10[14] times, k0[2]. 40[44] sts remain.

Work in stockinette st until work measures 3 inches from p round. Break MC.

Using CC, work in 2x2 Rib for 4 inches.

Next Row: Work 21[23] sts onto 1 needle in Rib as set; turn work so that WS is facing. Heel will be worked back and forth on these 21[23] sts; remaining sts on hold for instep.

Yo, p20[22], turn work.
Yo, k19[21], turn work.
Yo, p18[20], turn work.
Yo, k17[19], turn work.
Yo, p16[18], turn work.
Yo, k15[17], turn work.
Yo, p14[16], turn work.
Yo, k13[15], turn work.
Yo, p12[14], turn work.
Yo, k11[13], turn work.
Yo, p10[12], turn work.
Yo, k9[11], turn work.
Yo, p8[10], turn work.
Yo, k8[10], k2tog (knit yo together with next st), turn work.
Yo, p9[11], p2tog tbl, turn work.
Yo, k10[12], k3tog, turn work.
Yo, p11[13], p3tog tbl, turn work.
Yo, k12[14], k3tog, turn work.
Yo, p13[15], p3tog tbl, turn work.
Yo, k14[16], k3tog, turn work.
Yo, p15[17], p3tog tbl, turn work.
Yo, k16[18], k3tog, turn work.
Yo, p17[19], p3tog tbl, turn work.
Yo, k20[22], k3tog. 23[25] sts remain on this needle, including the 2 yo. This needle will be designated Needle 3. Slip the last st from Needle 3 to the next needle; this will now be designated Needle 1, and the remaining needle will be Needle 2. Evenly divide the 20[22] instep sts between Needles 1 and 2.

Next Round: Work sts on Needles 1 and 2 in 2x2 Rib as set; k3tog, k to end of Needle 3. 40[44] sts.

For Toeless Sock:
Work in patt as set, working sts on Needles 1 and 2 in 2x2 Rib and sts on Needle 3 in stockinette st, until foot measures 4 inches or desired length. BO all sts loosely.

For Full Sock:
Work in patt as set, working sts on Needles 1 and 2 in 2x2 Rib and sts on Needle 3 in stockinette st, until foot measures 2 inches less then desired length.

Decrease Round: K1, ssk, k to end of Needle 1; k to last 3 sts of Needle 2, k2tog, k1; k1, ssk, k to last 3 sts of Needle 3, k2tog, k1.

K 1 round.

Repeat these 2 rounds 4[5] times more. 20 sts remain. Break yarn, leaving a 1-yard tail.

Slip sts from Needle 2 to Needle 1. Graft sts on Needle 1 to sts on Needle 3.