SISU Mouthguards are known for their unmatched protection, comfort, cleanliness, and remoldability. Though it might not seem possible, we made an even better mouthguard! SISU Tether uses the newer SISU 3D design that improves on previous SISU models, and adds a number of new features: Pre-formed guard for an effortless, fast, fit and go shape Includes a tether to attach mouth guard to helmet cage The SISU Tether features a quick-release mechanism to ensure safety of the athlete in the case of a helmet-removing contact, or in case of training personnel assisting a downed player needing to remove the player's helmet Variable material thickness to put protection where it is needed, and comfort where it is desired 2.0mm thin Pre-formed for an easy, perfect, custom-molded fit every time Up to $50, 000 limited dental warranty Youth size for athletes under 5' tall Works with braces (must be fitted by a dentist) *must size up to adult size for athletes under 5' tall Non-toxic: BPA, BPS, Latex, PVC, Phthalate free Sisu Youth Tether Mouthguard in Royal.