Under Armour Youth Alter Ego Socks - Spiderman Red/blue (Large) 96% polyester/2% nylon/2% spandex ArmourBlock prevents growth of odor-causing bacteria in Under Armour socks ArmourFit supports in the key arch and ankle for a stable, firm fit ArmourGrip prevents sock slippage ArmourStretch 4-way stretch delivers a comfortable fit and feel Embedded Arch Support fights and reduces foot fatigue