At a lean 1.6mm, the ultralight design of the Aero is 50% thinner than conventional sports mouth guards, providing maximum comfort and convenience. Combined with its quick, custom and remoldable fit, you´ll entirely forget it’s there. Custom fit, remoldable SISU NextGen features a wider bite pad, rounded edges and improved moldability to empower athletes to talk normally, breathe naturally and stay hydrated during the game. Non-toxic: BPA, BPS, Latex, PVC, Phthalate free!