Zoot Sports Men's Ultra 2.0 CRX Socks 2% NanoGLIDE/ 83% Nylon/15% spandex Imported SilverTECH= 99.9% Antimicrobial Protection NEW - NanoGLIDE yarn knit into heel and toe reduces blistering and hot spots and keeps feet drier and more comfortable CRx = improved blood circulation BIOwrap = targeted muscle stabilization 18-30mmHg compression level