Pre 2022 suits come with the Si-Tech Neck-Tite ring system, and 2022+ model years come with "SLT Flexneck" which my understanding is the Si-Tech Quick Neck ring system (their 2nd generation neck ring system which is more flexible than the the Neck-Tite ring which is their 1st generation neck ring system).
SLT (Seal Lock Technology) is just Aqualung's parlance for Si-Tech's neck and wrist ring systems. Waterproof had their own parlance for the same using the acronym ISS (Integrated Silicone Seal) system.
-Z
In post #177 I mentioned that it was my understanding that Aqualung switched to Si-Tech's 2nd generation neck ring system, the Quick Neck....after further scrutiny of Aqualung's product offerings, it seems that the "SLT Flexneck" is Aqualung's parlance for Si-Tech's 3rd generation neck ring system, the ORUST.
I was also wrong about the following:
The picture on the website shows the suit with blue stiching....I might be wrong but I don't think the 2016 model year (first year for the AirCore suits) came with blue stitching, I think it came as black with black stiching or black with white stiching.
I have gone back and double checked this. Aqualung was offering blue stitching as an option on the Fusion Bullet skins that came on DryCore suits as well AirCore suits. So this option/feature should not be used as a means to date a suit.
-Z