Butler Creek 20160: This eyepiece is the absolute pinnacle of protection for hunting and shooting aficionados. Our Flip-Open scope covers are tailored to fit your scope perfectly, ensuring a watertight and airtight seal. They can be effortlessly opened with the simple press of your thumb, allowing for quick and precise shooting, even under extreme conditions. The design features an ergonomic button with a non-slip surface for seamless one-touch action. A silent hinge is incorporated into the fast, flip-open design to maintain your focus on the target without startling game. Despite its robust performance, it is extremely lightweight, weighing less than an ounce. It has also been rigorously tested and proven to function efficiently even in temperatures as low as -40 degrees F.