Solar Oil was a big hit this week. I'd have to guess that the nice weather subconsciously makes you order solar oil. Who knows? I asked our customer service team what Solar Oil was all about and they said it is a blend of three natural oils and vitamin E that serves double duty as both a nail strengthener and conditioner, as well as a cuticle softener. I don't really quite know what that means... why? I have no idea... I'm just a shipping guy! See our great Solar Oil selection HERE!