Callaway X-Series Mens Ultra Low Socks 24% nylon Fitted arch, reinforced toe and heel. DrySport moisture wicking performance fabric. Non-slip comfort, cushion and durability. Ultra low cut ankle level. Callaway Golfs DrySport moisture wicking performance fabrics, fitted arch and reinforced toe and heel provide the ultimate in non-slip comfort, cushion and durability. 73% Comfortrel XP Polyester, 24% Nylon, 2% Spandex and 1% Polyester. Made in USA.