SISU mouth guards let players communicate and breath better because the molded plastic is thinner and stays with the top set of teeth. Many goalies and defensemen, who are yelling all the time, love the breath-ability of SISU mouth guards. SISU is known for offering more protection and "less" mouthguard. This mouthguard can be custom fit and has a $35,000 US dental warranty. This mouthguard is recommended for youth players ages 7 - 10 years of age.