Mystery sock has 4 parts: Toe and foot, Gusset and heel turn, Heel flap, and Leg and cuff.

SIZING: Small (Medium, Large)
Standing Circumference ball of foot: S, 8.5” (21.6 cm); M, 9.0” (22 cm); L, 9.75” (24.8 cm).
Total sts foot/leg: 60/60 (64/66, 72/74-75).

Finished Medium sock measurements.
½ instep, 2¾” (7 cm); ½ heel diagonal, 4⅜ inch (11.1 cm); bottom of heel to top of cuff, 6¾” (17.2 cm); cuff, 1¾“ (4.5 cm); foot length, 9½” (24.1 cm). Medium has snug fit.

GAUGE:
Stockinette in round: ~9 sts, 12.5 rows per inch (3.5 sts, 5.0 rows per cm).
Traveling Stitch Pattern in round: 14 sts, 12 rows per inch (4.72 rows per cm).
EOP: 16 rows per inch (6.3 rows per cm).

MATERIALS:
Yarn: ~1 skein 400 yd (366 m)/100g Fingering Weight sock yarn; CC, ~ 25g of similar weight fingering yarn. ~60g for pair of medium socks with measurements stated. Tea and Yarn; 75/25% SW merino/nylon; 437 yds (399.6 m)/100g; violet.

Needles: 24-inch circular needle size US 0 (2.25 mm); smaller diameter needle or toothpick for picking stitches to work 3-needle BO .

Other: Darning Needle, at least 2 closed stitch markers, and stiff ruler.

DIFFICULTY: Experienced - toe-up sock construction, traveling twisted stitches, charts.