The adidas Team Speed Pro OTC Soccer Socks feature breathable mesh channels and moisture-wicking yarns to keep you dry and comfortable. The footbed contains Traxion cushioned pods and the adidas' 3-stripe design. These socks also feature added compression in the arch and ankle. 

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