This sock is knitted top down in 2 colors with fingering weight yarn and US size 1 needles (2.25mm)
The sample in the pattern is size medium, knitted with cascade heritage as the main color and malabrigo sock as the contrast color.

The length is customizable, these sizes are based on width:
Small: US Women’s size 5 and below, children
Medium: US Women’s size 6 to 10, US Men’s size 8 and below
Large: US Women’s size 11+, US Men’s size 9+

The required amount of yarn depends on the length of the sock, but for ankle length socks, I estimate:
Small: CC - 80yds, MC - 250yds
Medium: CC - 120yds, MC - 300yds
Large: CC - 150yds, MC - 350 yds

I haven’t knitted the smallest size yet, so the corresponding shoe sizes listed in the pattern for that size are an estimate.