Venum "Challenger" mouth guard is new and improved to provide you a perfect custom fit all while keeping you safe and making sure everything in your mouth stays in place. The custom fit design helps prevent any injury and enhances your performance. The lower rubber frame, absorbs the shock when you bite and diffuses it in the direction of your strongest teeth. Made with an advanced Nextfit gel frame for better comfort and added an exclusive breathing channel for a clear passageway of oxygen during training.