Smaller needles are used for cotton, larger for the wool.

Manos wool gauge: 16 stitches and 32 rows in 4 inches of garter stitch

Cotton Stria scarf requires two (2) skeins. Manos wool version says to use “small amounts of several colors. Use your leftovers”

Finished sizes as written:

Cotton: 4” x 48”
Wool: 4.5” x 45”