Relatedly: - The padding in fights is much lighter than in practice or sparring. The added weight is good for conditioning, blunts sharp impacts, and slows down your speed. - If you spar anyone, you're expected to have at _least_ 14oz gloves. If your gym says otherwise, don't spar there (and arguably, don't train anywhere that doesn't take safety seriously). - Luis Resto, a boxer, was jailed for swapping the padding in his gloves with plaster. He ended the career and permanently damaged the eyesight of his opponent, Billy Collins Jr.