Scientifically tested. Athlete approved. Zoot’s Ultra 2.0 CRx Socks continue to top the charts as a favorite piece of gear by athletes all over the world. NEW – NanoGLIDE™ yarn knit into heel and toe reduces blistering and hot spots and keeps feet drier and more comfortable. Updated with graduated muscle-specific zones of compression to stabilize muscles, reduce damage during exercise, and improve performance. Keep your legs feeling fresh through training and racing with Zoot’s Ultra 2.0 CRx Sock.