96% Polyester, 4% Elastane Imported Ultra-thin, lightweight construction for a barely there feel Locked-in fit design keeps sock securely on heel for an adjustment free fit that won't fall down Strategic mesh panels on top of foot for breathability Material wicks sweat & dries really fast Seamless toe delivers superior comfort & reduced irritation Interior no-slip silicone grips on back of heel helps keep your socks from sliding down 6 pairs of socks Front comfort tab protects top of foot from lace bite & irritation