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 thumbs, so you can put your shot through the narrow window of opportunity in the most extreme conditions. -Fast, flip-open design – keep 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 –40°F. -Truly ambidextrous. -Weigh less than an ounce. -Also made for spotting scopes.