Row 6: Sl1, K5, K2tog, K1, turn (leave rem sts unworked)
Row 7: Sl1, P6, P2tog, P1, turn (leave rem sts unworked)
Row 8: Sl1, K7, K2tog, K1, turn (leave rem sts unworked)
Row 9: Sl1, P8, P2tog, P1, turn (leave rem sts unworked)
Row 10: Sl1, K9, K2tog, K1, turn (leave rem sts unworked)
Row 11: Sl1, P10, P2tog, P1, turn (leave rem sts unworked)
Row 12: Sl1, K11, K2tog, K1, turn (leave rem sts unworked)
Row 13: Sl1, P12, P2tog, P1, turn (leave rem sts unworked)
Row 14: Sl1, K13, K2tog, K1, turn (leave rem sts unworked)
Row 15: Sl1, P14, P2tog, P1, turn
Split the remaining heel flap sts so there's 8 sts on Needle 4 and 9 sts on Needle 3. Begin working in the round again.
Round 13: Pick up and K11 sts along heel flap edge on same Needle 4; K across Needles 1 & 2 in Striped Cloverleaf Eyelet Pattern; pick up and K11 sts along the other heel flap edge with Needle 3 and K remaining sts on Needle 3. K across Needle 4 to get to the end of the round.
Gusset Shaping: (decrease)
For the Gusset Shaping and the rest of the pattern until the end ribbing, work in the Striped Cloverleaf Eyelet Pattern across Needles 1 and 2 and stockinette stitch across Needles 3 and 4.
Round 14: Needles 1-2 - K across in Striped Cloverleaf Eyelet Pattern.
Needle 3 - K1, SSK, K across.
Needle 4 - K across until last 3 sts, K2tog, K1.
Round 15: Work across in the appropriate pattern for the needle.
Repeat Round 14 and Round 15 until there are 61 sts total, with 15 sts on Needles 1, 2 and 4 and 16 sts on Needle 3.
Round 16: Needles 1-2 - K across in Striped Cloverleaf Eyelet Pattern.
Needle 3 - K1, SSK, K across.
Needle 4 - K across. (60 sts total)
Continue working in Striped Cloverleaf Eyelet Pattern until you reach 1 inch less than your desired length.
Ribbing:
Rounds 17-27: K1, P1 across.
Bind off using the Icelandic Bind-Off for a stretchy finish. Video tutorial available here.