The ultimate objective lens protection for hunters and shooters Flip-Open scope covers are custom fit to your scope create a watertight airtight seal and open with a touch of your thumb so you can put your shot through the narrow window of opportunity in the most extreme conditions. The fast flip-open design with a silent hinge keeps your eye on the target and won t spook game. It weighs less than an ounce and has been tested to -40 degrees F.