New sizing system for SISU Aero Research suggests that the taller you are, the larger your dental arch. And so, with increasing body size, a larger mouthguard is needed. Our new and improved sizing system uses the results of extensive research and testing to suggest the right protection for you based on your own measurements. Check out our size chart to find your perfect fit. DETAILS:Age 7+ (Use Medium or Large with braces)Aero Medium and Large are compatible with braces (Aero Small is not)Aero Small can be used as a junior mouthguard or for adults with smaller mouthsNon-toxic: BPA, BPS, latex, PVC, phthalate-free ADVANCED TECHNOLOGYThe SISU Aero Mouthguard is the latest development in mouthguard technology from the manufacturers of SISU Guard. Simply put, it's the strongest mouthguard we've ever built. With its unmatched quality and functionality, SISU NextGen is designed specifically for athletes, and its unique new features focus heavily on added protection and comfort.MORE PROTECTIONThe Aero is made of a high-tech thermoplastic material that is 30% stronger and has 8 times greater tensile strength than traditional mouthguard materials. This means that no matter how intense things get during playtime, your SISU Aero has your back and teeth.MUCH LESS MOUTHGUARDThe most unique feature of the SISU Aero is its super-slim, ultra-lightweight design. At a slim 1.6mm, the Aero is 50% thinner than your standard mouthguard. Combined with its fast, customized, and customizable fit, you'll completely forget there's something great and plastic in your mouth. SISU AERO IS THE BEST MOUTHGUARD FOR TEAM SPORTS:ICE HOCKEYLACROSSEFOOTBALLBASKETBALLROLLER DERBYUnd more