The Ares 10×42 features Advanced Fully Multi-Coated ED glass lenses and BaK4 prisms with the new ESP Dielectric Coating and Phase Coating. They bring premium clarity and brightness within reach of most avid enthusiasts. Their tough Magnesium chassis is fog proof and waterproof. Filled with Argon gas to give better internal fog proofing and thermal stability. They are covered with a durable rubber armor. Bottom line? Just like Ares the Greek god of war, they will stand up to punishment. They’re the perfect combination of lightweight construction, optical quality and rugged durability.