The EZGuard Shock Doctor Ultra STC Mouthguard uses smart technology for a comfortable, effective fit. STC (Super-Tight Compression) Gel-Fit liner custom molds to the teeth for a tight, comfortable fit. Shock Transfer Core, a new, lightweight profile, fits closer and directs impact away from the vulnerable front teeth to stronger, triple-rooted molars to stabilize and shield the teeth. Air Cushion Shock Pads have a spring effect for a more comfortable jaw compression rate and improved fit. MORA performance means that when fitted and worn correctly, the Ultra STC positions the lower jaw down and forward and the tongue up onto the roof of the mouth, which may increase strength and athletic performance. The convertible, quick-release tether allows the mouthguard to be used strapped or strapless. The Ultra STC gives the ultimate protection in an improved, better-fitting compact size for easier breathing and speaking. Latex Free. Not for use with braces. $12,500 dental warranty included. Adult size is for ages 11 and up. Youth size is for ages 10 and under.