a special Ortho-Channel fits around both upper and lower teeth brace brackets and adapts to changes in tooth position as braces are adjusted, providing an instant fit and protection from lacerations. (2) BREATHING CHANNELS through the center of the mouthguard allow for freer flow of air and easier breathing. (3) 100% MEDICAL-GRADE SILICONE for ultimate comfort, no boiling or fitting required. Meets NFHS wrestling rules required full coverage of upper and lower brace brackets in all wrestling meets. Strap model includes a quick-release helmet tether. Latex Free