One Size fits most should read fits tweens and teens with no calves, (or come with a ‘we mean in Japan’ caveat) I do not have large calves, but I'll be donating these to my 8 year old. The material is strange and shiny and barely stretchy, but the socks look great! – until you put them on, at which point you find the print is only on the outer edges of the ribbed fabric and the pictures fade out to a random pastel blur. So much promise, but pretty disappointing fabric choice for a licensed product.