Infinity Scopes features extended eye relief. Waterproof, fog-proof, nitrogen gas-filled. Shock resistant to 1000g. See-thru/flip-up lens caps, optical-quality/all-weather. Rubber coated, speed focus eye piece. Durable leaf spring for windage and elevation adjusments. Multi-coated lenses provide maximum brightness, clarity and contrast even in the poorest of light conditions. One piece tube made aircraft quality aluminum. Durable, scratch-resistant, non-reflective matte finish. Easy to zero-in.