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. FEATURES: 2.0mm thin Pre-formed for an easy, perfect, custom-molded fit every time Up to $50,000 limited dental warranty Adult size for athletes over 5' tall 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