This scope cover will protect your scope from dirt, moisture, scratches and dents. It is constructed of neoprene which pulls moisture away from the scope to protect against corrosion and rust. Scopecoat is a proven design that has been field tested and recommended by the North American Hunting Club.Notes: Safeguards scope from dust and dirt, moisture, dings and scratches.Neoprene has a 5% moisture absorbency to wick moisture away from the scope to aid in prevention of rust and corrosion. The nylon material shields against the elements. May be washed in warm water then turn inside out to dry.To install stretch both ends over your optic. The recommeded fit is either "relaxed same length" or slightly stretched.