Feetures Men's Pure Comfort Medium Cushion Crew Socks 35% Rayon derived from Bamboo/34% Merino Wool/18% Nylon/9% Polyester/4% Lycra Imported Fabric Type: 35% Rayon derived from Bamboo/34% Merino Wool/18% Nylon/9% Polyester/4% Lycra; Import Designation: Imported Feetures produces all of it's socks with a higher thread count than most socks This results in a softer and stronger sock