The Opticron Compact Binocular Rainguard is designed to protect your binoculars' eyepieces from rain, dust, dirt, and accidental damage. This durable, one-piece plastic cap offers a universal fit with an internal diameter of up to 34mm, ensuring compatibility with most compact binoculars. For added security, the rainguard can be easily attached to your binocular strap, keeping it safe and accessible when not in use.