Simply the ultimate scope lens protection for hunters and shooters. They’re 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.Fast, flip-open design keeps your eye on the target.Silent spring hinges won’t spook game.Water-tight, custom fit friction mounts anchor them to your scope.Air-tight semi-O-ring keeps out dust and moisture.Tested to 40F.Truly ambidextrous.Weigh less than an ounce.Also made for spotting scopes.