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They are a big help.I can see the smaller readings on my computer ,and they also help with the small critters.easy to install,and they stay in place no matter what de fog I use or how hard I rinse my mask.I just spent a week on a Caribean live aboard with no problems.
Sizes run too small.this product .Size XL is too tight.I have the same item in 2 different brands in XL and they fit fine.
Nice design comfortable works great.