The Pilairo mask originally only came with one headgear which was a StretchWise headgear whilst the Pilairo Q adjustable headgear was designed later as people wanted adjustment on the headgear. The Adjustable headgear and the StretchWise headgear are able to be used on the original Pilairo and Pilairo Q as it has the same clip system.
Pilairo Q Headgear
The StretchWise headgear is much simpler as it has no adjustments but over time can be prone to stretching and this will then not hold the mask in place properly. There is no solution once the headgear has stretched other than to replace the headgear.