AirScreen System Goggle LensConcept The Airscreen Lenses allow you to open and close your lens when ever you desire. No need to take the goggles off when you are in difficult areas or waiting for your friends. Its a bit to warm ? Nothing better than a small breath of air to dry the foam and refreshing your face. To open it, you only need to push the clips inwards to unclips. To close it, press the clips against the lens and push them outwards. Advantage : adaptable to most types