Happy to have purchased this as it really makes a difference to how the mask fits my face. I was finding that there was always a gap, particularly at the side of the jaw and by adjusting the extender I was able to have a snug neat fit. I would change the name and call it an ‘Adjuster’, as I almost didn’t buy it, as I didn’t need to extend my mask, rather diminish it a little. The other bonus is that the mask stays in place, therefore no need to handle it in situ. Good practice made easy. Mask Extender. Worked brilliantly for my husband who didn’t need to ‘fiddle’ with his mask either.