I bought this for club activities, but it was a little too small, so I'm selling it. It's a three-quarter sleeve, high-neck type. The neckline hasn't stretched. There are marks from my name written on the inner tag, which has been edited out. The armpits are made of mesh material, so it seems like it will be well-ventilated. #Zett #BaseballUnderwear #ThreeQuarterSleeve