SISU Tether MouthguardSecure connection to your helmet! 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 mouthguard to helmet cage The SISU Tether