cotton
Pattern Dress Socks in a Value 6-pack of Assorted Colors
Comfortable Stretch, Ribbed Texture, Absorbant and Durable Cotton
100% Polyester
Imported
Machine Wash Warm Tumble Dry Low

Yes, the above is copied and pasted from the description provided on the website.  It says clearly that they are cotton and 100% Polyester. Undoubtedly a secret process with only one copy of the formula buried in Fort Knox (along with all the gold we owe to China).