Have never used an anti-fog solution that works any better than toothpaste.  Quality of goggles is the usual starting point for issues of fogging up and eventually goggles will all suffer the same fate.  No need to purchase this item.

For awhile these drops worked great, and I thought the search for the perfect anti-fog drop was over.  Now, a few months after using them I find my goggles fogging up after 15 or so minutes.  Not completely, but enough to annoy me.  The search goes on!

See review headline.  Save your money and try a home remedy.

I don't know about anyone else but it worked perfectly for me

Does not work 100%, but works ok. No fog for first half of swim. Fog begins to appear so a second application is necessary.

I've bought a lot of this product .  Hope springs eternal, but not having good results  in  our pool in Fla.