Underoos are still around and now they come in adult sizes
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Underoos - Wikipedia
Underoos made boring old kids' underwear fun to wear in the 1970s & 80s (and beyond) - Click Americana
It's underwear that's fun to wear! The Original Underoos are back, featuring exciting DC Comics character designs that are sure to impress your child.
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Pack includes 5 pairs of Underoos® briefs, each featuring a different graphic of his favorite characters or superheroes Graphics and characters vary
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