Butler Creek 70209: Blizzard scope covers feature Butler Creek\'s Flip-Open cover design with silent, spring loaded operation, and clear windows for fast target acquisition at close to medium ranges. Tabs on both sides of the lid are easily opened by right or left handed shooters. Blizzard lenses are made from optical-grade polymers for optimum clarity and light transmission, the best of any see-thru cover. Blizzard scope covers tested reliable in extreme conditions and create a weather-resistant seal around objective and ocular lenses.