ToeSox Sport Perfdry Ultralite Weight No Show Socks 90% Polyester; 10% Spandex Imported Five toe construction promotes circulation, removes moisture (helps fight athlete's foot) and eliminates friction and blisters between toes No show heel tab keeps sock from slipping and protects Achilles tendon Vector heel creates defined heel cup for optimal fit Thin membrane with durable fibers for long-lasting wear Arch band provides gentle pressure to lift and support