Bring the Thunder-this lip guard is ready to start on game day right out of the box with a no-boil, instant fit. Breathe easy with a high-flow breathing channel and the heavy-duty permanent tether attaches quickly and securely to any football helmet. Features: Heavy duty permanent tether strap securely attaches to helmet High-flow BOLT airflow breathing channel for easier, deeper breaths Full protection for your teeth and lips No-boil, instant-fit right out of the box Works with braces One size fits most