The Undercap is underwear for your head
Feeling a little chilly under that stocking cap? Tired of scalp irritation from wearing that fedora? You need an Undercap™! Each 95% cotton, 5% spandex cap is just like underwear for your head. Wear it underneath your hat for extra warmth and protection! Wear it by itself for a wacky new fashion statement! Hundreds of uses! Fits most adult heads.