New Other DonJoy Performance Large Trizone Calf Sleeve Black feed cond new Precision machined aluminum construction GLDS3003 OS Green Precision machined aluminum construction New design is more lightweight and dramatically more ventilated Box damage due to storage Three zones of compression strategically placed around the shin and calf deliver peak performance Silicone banding injected directly onto the sleeve wraps and supports the calf muscle during activity to significantly delay the onset of fatigue All natural carbonized bamboo is thermal regulating and anti bacterial helping eliminate odors Anti migration technology helps to eliminate slip Reflectivity for enhanced visibility in low light conditions