The "I'm Back" Oxygen Football Mouthguard is designed and developed by athletic, dental and medical experts to deliver superior airflow and better performance. FEATURES: No boiling required Works with braces Helps open TMJ Maximum breath-ability Advanced composite Absorber shield Comes with attachable strap One Size Fits Most Patented design leverages SCUBA breathing innovations Largest breathing hole on the market Unlimited Defective Guarantee 5K Dental Warranty with or without braces