Really Works!
I tried a few different types of anti fog products.  Being that I have to wear a mask and glasses at work I needed something to stop my glasses from fogging up all the time.  This one really works.  I clean my glasses well and then spray this on the inside of the lenses.  Then I rub gently to make sure the product is spread evenly.  Let air dry and in about 5 minutes I buff the product off.  I don't overrub it off to make sure I don't remove the protection.  But it works great.  I would highly recommend to anyone having issues with glasses fogging while wearing a mask.  Plus the bottles are going to last a long time!  You only need one spray per lens.  And the protection lasts all day and sometimes up to 2 days.
Rating: 5 stars