Under Armour Mens Heatgear 3-Pack Crew Electric Blue/Assorted Socks MD 9-11 (Mens Shoe 4-8.5) 20% cotton 77% Polyester/20% Cotton/3% Elastane Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes Embedded arch support reduces foot fatigue Seamless toe & contoured "Y" heel for the perfect, comfortable fit