Perfect for the soccer player who prefers a lightweight snug-fitting sock.

adidas sock guide:
XS: 9C-1Y Youth Shoe Size
S: 13C-4Y Youth Shoe Size
M: 4Y-6 Youth Shoe Size, 5-9.5 Women's Shoe Size, 5-8.5 Men's Shoe Size
L: 10-12 Women's Shoe Size, 9-13 Men's Shoe Size
XL: 12-16 Men's Shoe Size