PanzerGlass Garmin Edge 530/830 Anti-Glare

PanzerGlass™ screen protection for Garmin Edge 530/830 protects the screen on your bike’s display against shocks and scratches. PanzerGlass™ is made from tempered glass, which makes it very strong and able to protect your gear from the types of impact associated with an active lifestyle.
The glass in this screen protection has an anti-glare effect, thereby limiting the reflection from the sun, etc., and allowing you to see the display even in very brightly-lit surroundings.   

Furthermore, the glass is water-resistant and can withstand humidity.