Eye shield is a flexible moldable material that connects to the eye piece of binocular. Eye shield will cradle your eyes preventing the ambient light from coming between eyes and eyepiece removing glare. Eye shield also protects user from the elements like dust, wind, rain, and snow. A economical for any binocular user. 2 sizes available standard 1.45" to 2.5" eyecup and compact 1.1" to 1.5" eye cup.