SISU Mouth Guards Adult 1.6 NextGen mouthguard, One Size Designed with the athlete in mind sisu nextgen is the most powerful Mouth guard our scientists have EVER built Made from non-compressible thermo-polymer and powered by patented diffusix technology, sisu nextgen is engineered to withstand even more impact with its scientifically re-designed perforation pattern Still astonishingly 1.6 mm thin, sisu nextgen S16-NG-PP-1 features a wider bite pad, rounded edges and improved moldability for even more comfort Place the flat Mouth guard into hot (not boiling) water to soften the material and Use Gentle suction to a create personalized custom fit, completely unique to your Mouth Empowers athletes to talk normally, breathe naturally and stay hydrated during the game