Shock Doctor's Interchange lip guard lets you easily change up your style - day to day, game to game, kit to kit. And because it's Shock Doctor, you don't compromise protection, comfort, or convenience for style. No boiling needed.Just pick your shield, pop it in and smash the competition. FEATURES: Instant Fit - No Boiling Needed Exclusive For Interchange - Shield works only with Shock Doctor Interchange lip guard. Change It Up - Easily swap lip guard shield designs day to day, game to game, kit to kit. Additional shields sold separately in single and double packs. Rep Your Squad - Collect shield designs every game, every mood, every W. Ultimate Comfort - Contoured design fits naturally and Max Flow allows for easy breathing. Legit - Meets national and high school rules and regulations. No Funny Business - Latex Free, BPA Free, Phthalate Free. Interchange Shields sold separately in single and double packs