When hunting or shooting in rough terrain or harsh conditions it is important to keep your lenses as clean as possible. The Element Scope Cap does that and it keeps your Data On Previous Engagement information where it is easy to see. The interchangeable DOPE Disk can be changed as conditions change. The lens cap flipper lets you open the cap with one hand. The cap can then be left at the 180 position to see your date or flipped to 270 to get it out of the way.