The SISU Aero (1.6) Ultralight Adult Mouth Guard is perfect for a sport like Roller Derby where communication, comfort, and protection are key. The SISU Aero is made from a high-tech thermoplastic material that provides 30% better protection than conventional mouth guards, despite being only a sleek 1.6mm thick (that's over 60% thinner for Maximum Comfort)! Compared to the larger mouth guards that require you to take out in order to talk, drink ,etc the Sisu is only 1.6mm thick and hugs your teeth allowing you to speak clearly, drink normally and much more. The SISU Max mouth guard offers the same features as the Aero, but it is 2.4mm thick. It is designed for high-impact sports and provides superior protection with only a slightly thicker mouth guard. Made in the USA - BPA, Latex, PVC, and Phthalate free.