"This long-sleeve underwear uses a UV cutting material called “Cold Shade” along both sleeves, which shuts out sunlight to prevent the temperature inside the jersey from rising. It is perfect for summer rides since it prevents sunburn. The body uses “Cool Fit Dry®,” which quickly absorbs sweat to prevent stickiness and maintain a dry feel, ensuring outstanding comfort. The sleeves also fit close to the arms so they reduce air resistance without fluttering, making it an underwear that almost feels like you are wearing arm covers. "