I dont understand it. They train normally in grappling classes, with t-shirts on or gi on. But when it comes to the sparring class where we spar punches, kicks, takedowns etc. with boxing gloves on, they take off their t-shirts and spar half-naked. Why is this? It's not like they can grip with the boxing gloves on, so what is the point of it? I didnt want to ask them so ill ask here.