MaxxMMA Headgear L/XL Boxing MMA Training Kickboxing Sparring Karate Taekwondo

Even something like the padded helmets boxers use for training would surely help. Any padding is better than no padding. Something like https://www.amazon.com/MaxxMMA-Headgear-Training-Kickboxing-Taekwondo/dp/B01356307A/ That's $20.