I had a few when I was wee kiddo. Wonder Woman and R2D2 were my favorites. I wore them to sleep all the time; I even have an old a photo of me in my WW ones at my baby sitter's house!
So today I have a few polish underoos that I've worn under various glitter topcoats in recent reviews that I've done.
This is one of the two polishes in the Hot Topic duo set that had the Deborah Lippman dupe in it. Neither one had names, but isn't it a pretty shade of perwinkle?

This was worn underneath a PR Sample from Whimsical Ideas by Pam

Nanacoco's Irrestible Charm is a stunning one coater with a foil-like finish.

It was the perfect underoo color for a PR Sample from Pam.

Revlon Gumdrops is a polish I've had for at least a year, probably more. I had never worn it, so I chose it to go under a PR Sample from Pam.

And last today is my beloved Revlon Hazy. The perfect shade of grey for lots of glitter toppers!

What is your favorite underoo?
Products provided for review.