Shock Doctor, one of the best mouthguards in the world, is continuing getting better and making improvements year to year. With the Gel-Fit liner your teeth sit with a uniform fit and protection, and now the Gel Max is now easier to fit correctly. With engineering to where you can wear a helmet strap or not, the Gel Max features High Impact shock absorption with ultimate custom fit gel. A convertible tether is to use strapped to the helmet or without.