Socks are knit with 2 strands held together throughout.

Errata:

Page 35:

Chart 2 should include 2 additional stockinette sts, for a total of 17 sts.

Work Rows 1 - 6 of Chart 2, then dec round as written.

Chart 3 should include 2 additional stockinette sts, for a totol of 15 sts