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Sisu mouthguard, one of roller derby's most popular mouthguard. As invisible and ultralight as the air for which it was named, SISU Aero is the 1.6 mm high-tech mouthguard that started it all. Designed for athletes who prefer to easily talk, breathe and drink during game time (otherwise known as: all athletes), the Aero is revolutionizing mouthguards one mouth at a time.