Apparently it's glass yeah, it's very bendy so doesn't really feel like glass but I guess they wouldn't be able to market it as they do without it being true, here's the blurb from their website:
"BROTECT? AirGlass? Premium Glass Screen Protector
BROTECT? AirGlass? Premium Glass Screen Protector, the Extra-Hard and Ultra-Light sidekick for your device!
This glass sidekick BRO is new in Europe and contains an exclusive and revolutionary technology in screen protection - AirGlass?, exclusively offered by BROTECT?!
It is 2x thinner and lighter and therefore more flexible than all the other glass protectors on the market. And it still offers the extra strong anti-scratch hardness of glass protectors.
Its Ultra-Light properties and High-Transparency ensure you have a clear and sharp view of all the screen content, while providing a unique touch-screen sensitivity.
The BRO has an additional Anti-Fingerprint layer that prevents dirt and fingerprint smudges and ensures that they can be easily removed.
The adhesive layer ensures that the BRO glides smoothly onto your device for a bubble-free and easy installation.
The sidekick for your device is manufactured with care by our specialist team in Germany. Have fun with it and enjoy the feeling!
P.S.: Our sidekick BRO is made of real glass and still flexible! See for yourself: Twist the piece of AirGlass? remaining on the release film."