The Ultra 2 Shock Transfer Core (STC) Mouthguard offers lower profile, triple layer protection with a deep, form-fitting bite for easier breathing and speaking and is designed specifically to transfer shock away from the point of impact. This mouthguard also comes fully equipped with a convertible tether. The triple-layer protection with deep, form-fit bite for easy breathing, is perfect all impact sports, like Hockey, Lacrosse, Football & more.