Rhino Socks MX Series, PistonBone, Grey/Black, Knee high Sports Socks 39% Combed Cotton, 31% Polyamide, 24% Coolmax, 6% Ployamide Cordura Imported Machine wash warm inside out. Fabric softener is recommended. Tumbledry low, NO BLEACH Made in Italy The New Extreme in High Preformance Socks