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Ordered these as I was having issues with rain on the lenses and fogging in cold weather basically rendering the camera useless. I did look at the cheaper options as these are a little pricey in my opinion, however opted for these. They fit brilliantly are very good quality and most importantly work. The little hood stops the rain from running down over the lens, I'm not saying totally eliminates it in torrential rain but the recording is still of a good enough image to identify what's happening and dries off very quickly. It has eliminated the fogging. In regards to the night vision being affected, the 1st night I used them I got the 'glare' that some users have reported. This was down to me not pulling the skin fully back over the camera and by adjusting it so that the skin is not visible to the lens in camera positioning, this totally eliminated the issue. Spiders seem to love building webs over them on occasions.