The Butler Creek 30020 Flip-Open Objective Scope Cover for 31mm objectives in size 02 Black Polymer delivers premier lens protection for hunters and shooters, providing a watertight airtight seal that keeps dust, moisture, and debris out while still allowing quick access with a simple thumbs flip to keep your eye on the target. Built with a fast flip-open design, it preserves your field of view and ensures you can take a precise shot during the narrow window of opportunity in extreme conditions, with silent spring hinges that wont spook game. Its water-tight custom-fit friction mounts anchor securely to your scope, and the air-tight semi-O-ring further enhances protection, supported by a commitment to performance tested to -40F for reliability in harsh environments. Truly ambidextrous and weighing less than an ounce, this cover integrates seamlessly with your rifle setup, offering a reliable, low-profile solution for objective protection that aligns with both casual and serious hunting and precision-shooting applications.