The muted pink and light blue colors are cute! There are no size markings, but by amateur measurement, it is 9cm. I intended to have my baby wear them at 10 months old, but the heel didn't fit, and they were a little too small. Only the light blue socks were tried on once. Since they were too small, they were washed at home afterward. No stains or pilling. The other two are new and unused. Size... 10.5cm or less