It feels awful
Skip the middleman and apply menthol straight to your current liners.  What's supposed to feel "cool" and "refreshing" (like the other reviews mentioned) it just feels awful.  When I was wearing them, I was highly aware of the liner the whole time because of the herbal infusion.  It makes you feel cold, which is like wearing a wet liner.  Also, when I changed it after a few hours, the top layer was breaking apart and flaking.  Even without the herbal infusion, they're still not good.
Rating: 1 stars