The Jawline is the only cheek/jaw protector that can be used with All-Star batting helmets without impacting the helmet's warranty or SEI certification. The addition of protectors other than the Jawline to All-Star batting helmets may void the helmet warranty, particularly if the helmet is altered to do so or adhesives of any kind are used, and the SEI certification can no longer be guaranteed. The Jawline comes in right and left-hand batter-specific models to match your All-Star batting helmet.