In Finnish, “kesäyö” means summer night. While knitting the prototype shawl, I kept singing this song. English translation of the lyrics can be found here.

Kesäyö is a triangular shawl worked from the top down.

Yarn: Hedgehog Fibres Sock (400 m/437 yd per 100 g). Shown in Moss and Silence.

Yardage:
Two-colored version:
Color A: 600 m/656 yd (150 g)
Color B: 400 m/437 yd (100 g)
In the model shawl the green is color A and the off-white is color B. You will probably only need around 450 m/490 yd (113 g) of color A and 320 m/350 yd (80 g) of color B, but it depends a lot on your gauge.

If you use three colors, A as the green, narrow stripes, B as the white and C as the wavy sections, you will need:
Color A: 200 m/220 yd (50 g)
Color B: 400 m/437 yd (100 g)
Color C: 400 m/437 yd (100 g)
A bit less will be enough, so a full skein of B and C will do.

Gauge: 18 sts and 34 rows per 10 cm in stockinette stitch blocked.

Needles: 3.5 mm/US 4, or the size you need to make gauge. You’ll need a circular needle at least 100 cm/40 inch long.

Other supplies: Two stitch markers. Alternatively you can use up to 24 stitch markers in the wavy sections, if that makes knitting easier for you.