Professional boxers use a variety of glove sizes depending on the purpose. For competition, professional boxers typically use 8-ounce or 10-ounce gloves, with lighter gloves allowing opponents to feel the power behind their strikes. However, for training and sparring, professional boxers often prefer gloves in the 16 to 18-ounce range, which offer superior protection for their hands during intense training and bouts. The choice of glove size also depends on the boxers weight, with heavier boxers typically using larger gloves for added protection.