Tetrahedrons are molecules and polyatomic ions that have one atom in the center and four atoms at the corners. This fun cuff-down sock pattern, suitable for knitters who have mastered the basics, uses slipped stitches and purl rows to create a textured tetrahedron.

Finished Measurements
Foot circumference: 8 (9¼)” / 20.5 (23.5) cm
Shown in size 9¼” / 23.5 cm with ½” / 1.5 cm of negative ease

Yarn
MC: 1 skein of O-Wool O-Wash Fingering (100% organic merino; 428 yd / 391 m per 100 g) or 292 (416) yd / 267 (381) m of fingering weight yarn
CC: 1 skein of O-Wool O-Wash Fingering (100% organic merino; 428 yd / 391 m per 100 g) or 95 (111) yd / 87 (102) m of fingering weight yarn
Sample shown in O-Wool O-Wash Fingering in Erdenheim (MC) and Night Heron (CC)

Needles
One 9” / 23 cm circular needle in size US 2 / 2.75 mm
Needles for small circumference knitting (DPNs or long circular for magic loop) in size US 2 / 2.75 mm
Or use a needle size to obtain gauge after blocking

Notions
Three stitch markers (one in a distinct color or style for BOR), tapestry needle

Gauge
36 sts and 68 rnds = 4” / 10 cm in Leg patt after blocking

Notes
This pattern is written for a 9” / 23 cm circular needle but can be easily adapted to your preferred method of small circumference knitting.