Shock Doctor Nano 3D Convertible Mouthguard Exclusive NANO inner wall enhances fit Thin, lightweight structure absorbs impact Tri-bite stabilizers properly align the upper and lower jaw which may increase strength and athletic performance, known as MORA performance enhancement Gel-Fit liner custom molds to teeth for tight, comfortable fit Quick release tether allows the mouthguard to be used strapped or strapless Meets national and state high school rules Latex Free, BPA Free, Phthalate Free. NOT FOR USE WITH BRACES