Custom fit, remoldable SISU Mouthguards are only 1.6 mm for ultimate comfort and 30% stronger** for better protection. Equipped with Diffusix™ Technology, SISU Mouthguards oscillate on impact and diffuse the forces to the scientifically designed crumple zones. This unique design protects athletes from even the toughest hits. The perforations allow for natural flow of air and saliva, empowering athletes to talk, breathe and drink in sports where communication and hydration are key.