IST Mouldable Mouthpiece.
Mouldable to suit each individual’s dental profile.
The most outstanding benefit of having a properly fitted mouthpiece is less physical exertion is needed when using a second stage equipped with this mouthpiece, leaving the diver with significantly reduced fatigue.
Simply immerse the mouthpiece (including all of its attachments to keep its profile in critical sections) into 95°C / 203°F water for 30 seconds, place it inside mouth, biting down and sucking on it for 30 seconds.
Rinse with cold water and then recheck fit.
Repeat the process as necessary.