A simple lace pattern makes this a good transit or knit night project. This cowl is easily adapted to be narrower, wider, or deeper. Directions for a completely customized version are included.
Knit in the round from the bottom to the top with 75-100 grams of sock yarn. Larger needles than usual for a fingering weight yarn insures a light, yet warm, fabric. Heavier weight yarns could be used if desired. Just make sure to swatch first!
This is a classic and useful piece.
Oh, and did I mention, this is completely reversible? Enjoy!

The pattern is written out and charted. It has been fully tested.

Sizes
Small: 104 x 22 cm (41 x 8.75 in)
Large: 137 x 19 cm (54 x 7.5 in)
Custom: up to you!

Featured Yarn
Noro Kureyon Sock, shade 149
Sample is size Large and used 75g, 310 m (339 yds)

Yarn Requirements,
Fingering, sock, or 4 ply, weight yarn
Small: 225—250m (246 –273 yds)
Large: 310—365 m (340—400 yds)
Custom: Yarn amounts will vary depending on your yarn of choice, and your gauge. 60-100 g of fingering weight yarn will make a cowl within the dimensions listed.

Gauge
3 lace pattern repeats (18 sts) to 10 cm (4 in.) with 4.0 mm
(UK/Canadian 8, US 6) needles after washing and blocking.

This is a nice, stretchy, textured, and lacy stitch.
Drape and volume will be influenced by the weight and fibre content of your yarn.

Equipment
4.0 mm (8 UK/CAD, 6 US) circular needle*
60 cm (24 in.) for smaller, 80 cm (32 in.) for larger.
Or the size required to achieve the recommended gauge.
1 stitch marker
Tapestry needle to weave in ends.