INSTA-FIT PLUS - a special upper and lower ortho channel fits around brace brackets and adapts to changes in tooth position as braces are adjusted providing an adaptable fit and protection from laceration. THREE LAYER CONSTRUCTION - flexible outer shell conforms to teeth and brace brackets. Internal core provides stability for upper and lower teeth. Low perimeter Gel-Fit below brace brackets increases retention (remoldable after bracket adjustment). CONVERTIBLE TETHER - quick-release tether allows the mouthguard to be used strapped or strapless. Meets NFHS wrestling rules requiring full coverage of upper brace brackets in all wrestling meets.