cotton Imported 78% Cotton,20% Nylon,2% Spandex. Easy to Wash – Machine Wash or Hand Wash. Chiller Washing, no Bleaching Agent, Air Brying; Do not Becommend the use of Drum Drying, Ironing and Dry Cleaning. These Socks are made of High Quality Cotton. They are Super Soft and Light, Allowing Your Feet to Breathe and Keep Cool During Intense Exercise. The Best for Hiking, Camping Mountain Biking, Trail Running, Backpacking, Travel, Trekking and other Athletic Outdoor Activities and Wide Variety.