Sightron offers a Lifetime Warranty. Fully multi-coated lenses employ coatings on both surfaces of our precision ground glass to provide the maximum optical quality and light transmission. It is waterproof against rain, snow or humidity, Sightron optics are built using a 100% sealed system ensuring a lifetime of performance in the most extreme environmental conditions. Shockproof is rated for recoil and impact from even the toughest loads. Nitrogen filled to provide a lifetime of use from fogging and internal water buildup.