Here's  DIY video from Tactical Anarchy Airsoft on how to protect your Camera Lenses when playing airsoft, especially those who use Helmet/Action Cameras. Before starting the DIY, we always advice to get the best material that will not have a big effect on the image quality since some will distort or lower quality of footage... "How to Protect Your Camera Lens in Airsoft. This should work for CONTOUR, GoPro and the Replay XD cameras."