Waterproof binoculars and weather resistant binoculars are not the same. Although it sound like your binoculars are safe from the elements with weather-resistant features, there is a limit to the amount of protection you really get.

If you're out and about and there's a mild drizzle, a few snowflakes maybe a bit of humidity...you can be safe in assuming that your binoculars will withstand these mild weather changes. But more than this and you are taking risks in exposing your binoculars to the elements. The problem with binoculars that aren't completely waterproof, is that once dust or humidity of any type gets in - be it water, snow, fog...it will leave it's mark on the internal elements. This can be in the form of water spots, dust and speckles. You may even see rust breaking through eventually. This is not what you want.

The best way to protect your investment is to make sure that your binoculars are hermetically sealed, include rubber O-rings and are nitrogen gas purged. What is Nitrogen-purged? This is when the binocular is purged of any oxygen and hydrogen and refilled with Nitrogen which is an inert gas. Inert means it will not react with anything that could create water molecules or iniate fungus growth. Add o-rings to seal where the separate binocular segments meet, and you have a pair of binoculars that should survive after a dunk in ocean, lake or severe rain.

If you can afford it and plan to keep your binoculars for a long time, we highly recommend waterproof binoculars.
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All Terrain Waterproof Binoculars - Nitrogen Purged
Nikon 7432 Waterproof and fogproof  binoculars that are nitrogen-purged and o-ring sealed
 
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Bushnell H20 12x42 Waterproof Binoculars
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Bone Collector Edition - Roof Prism Waterproof Binoculars
Bushnell Trophy XLT 10x42waterproof binoculars
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Bushnell Marine 7x50 Binoculars - waterproof
 
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Extreme All Terrain Binoculars
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CELESTRON OCEANA 7x50 waterproof Binoculars