New Balance’s liner sock gives you low-visibility cushioning with soft cotton and an invisible comfort toe seam. Fabric stays tight for arch support and stability. 77% combed cotton/21% nylon/2% Lycra spandex. USA. S (Fits sizes 1 to 5-1/2) M (Fits sizes 6 to 10-1/2) L (Fits sizes 10-1/2 to 12-1/2) XL (Fits sizes 13 to 16)