Vortex Kaibab HD Binocular Rainguard - is always on-hand to keep the lenses of your binoculars dry. The Vortex Kaibab Binocular Rainguard is a one-piece ocular cover that protects the eyepieces of your Vortex binoculars. For convenience, the Vortex Rainguard Ocular Lens Cover can be attached to the neckstrap, where it is within easy reach. Simply slip the neckstrap through the attachment point on the Vortex Kaibab Rainguard before connecting the neckstrap to the binoculars.