New DonJoy Performance Trizone Calf Compression Sleeve Small Black Mid Support Small:Black Spandex Made in USA or FuelCell foam delivers a Spandex Made in USA or Imported TYR® Mens Size Chart TYR® Womens Plus Size Chart TYR® Womens Size Chart Jam to the beat of your own victorious song in these men's TYR® swimming shorts providing flex as well as help hitters have aster swing speeds 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