The Opticron 37mm BGA Binocular Rainguard provides dependable protection for binocular eyepieces with an outer diameter of up to 37mm. Made from durable polypropylene, this robust one-piece cap effectively shields your binoculars from rain, dust, dirt, and accidental damage, ensuring long-lasting performance. With an internal diameter of 37mm, it fits a wide variety of binocular models, offering a universal design for convenience. Additionally, the rainguard attaches securely to your binocular strap, keeping it in place and accessible when needed. Its compact dimensions (118mm x 40mm x 16mm) and lightweight build (weighing only 10g) make it a practical and reliable accessory for outdoor use.