The Flip-up Solid Front Lens Cover with integrated ARD (Anti Reflection Device) filter slides over the front end of the Acro P-2 sight for added lens protection. The cover is durable rubber and the lid and ARD both have spring-loaded flip-up mechanisms and snap closures. The cover easily flips open and out of the way effortlessly when needed and closes tightly with a snap. The use of lens covers protect lenses from scratches and keep the optic free from dust and debris during transport and storage. The flip-up function provides fast access to rain free and clean lenses when sight is in use, once it’s open the lid stays up until it’s manually closed again.