PRODUCT DESCRIPTION "Custom fitted for maximum protection". Butler Creek's "instant action" scope covers have been the number one choice of serious shooters and hunters worldwide. The flip-open has an inner O-ring that provides an airtight seal to keep out dust and moisture. Re-designed hinge provides silent action and flawless performance in all weather conditions. Ergonomic button design has a non-slip surface for one-touch action. FROM THE MANUFACTURER 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.