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.