A binocular Rain guard helps to keep the eyepieces of a binocular dry and clean in all weather conditions. A rain guard simply fastens to the binocular strap so it's constantly equipped to guard your eyepieces from materials that could damage the glass. A rain guard is basically a pair of loose-fitting plastic cups. It takes only a few seconds to take away the rain guard from the eyepieces. As a result there are no disturbances during the viewing process and you are sure to enjoy without missing a thing. A rain guard makes a binocular handy even when looking directly into the heavy rain.