Rivel Athletics Football Airflow Mouthguard/Mouthpiece is available in multiple colors and is super comfortable with increased protection of the upper and lower lips. The Rivel mouthguard is made from high grade silicone. It is also flexible and durable for maximum comfort. It was designed for maximum airflow as well, so you can breathe easily. One size fits most. Includes an attached strap to hang off face mask.