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.Please refer to the SIZE CHART below for the correct cover choice for you! 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 ?40degF Truly ambidextrous Weigh less than an ounce Manufacture Size: 40