Might seem a bit early to think about winterizing your binocular, but summer is slipping away, in case you haven't noticed. Winterize a binocular? Well, not in the sense that you winterize a car, but you can take some precautions when using a binocular in the winter to prevent damage. The biggest issue when using binoculars in the winter will be fogging, both externally and internally. The external type of fogging always occurs when the weather conditions are just right, regardless of whether your bino is waterproof and fog proof. You might try carry some of the Nikon Fog Eliminator, though I always carry a lens cloth to wipe condensation off my binoculars. Internal fogging is a different matter. Biggest culprit, here, is drastic changes in temperature and this directly leads to moisture condensing on the binocular. For this, I like to carry a binocular in a waterproof hard case. This allows the binocular to come slowly to ambient temperature and all without the problem of moisture condensing on the binocular. Just put the bino in the case when you are outside in cold temperatures, then bring it in the house, but do not open the case for an hour or so. When you open it, the binocular will be nice and dry. If you can't afford a hard case, a zip lock plastic bag will also work as long as it is tightly sealed.