Sports CompressRX Ultra Active Sock for men has been upgraded with ZoneRx
technology in 2011.
ZoneRx - Muscle-specific zones of compression stabilize the calf muscles
reducing muscle damage during exercise; CRx - Graduated compression from the
ankle to the top of the calf that helps remove lactic acid and improve blood
circulation back to the heart. SynchroRx provides moisture management and
temperature regulation. Achilles tendon support. Padded foot soles prevent foot