Shock Doctor Ultra 2 STC Mouthguard - Youth The Shock Doctor Ultra 2 protects with Aero-Cushion Anti-Shock Pads to create stronger, more comfortable jaw cushioning. The Shock Transfer Core™ directs impact away from the point of contact while MORA Performance Enhancement positions lower jaw down and forward. The advanced Gel-Fit™ Liner custom molds to teeth for a tight, comfortable fit, keeping you focused on the game. A convertible, quick-release tether allows for this mouthguard to be used strapped or strapless. Sz: Ages 11 and younger.