The tag says it's 100% cotton, but it's a very thick, stretchy material like Lycra/Spandex and doesn't feel at all nice and soft on shirt. I kept them (probably out of laziness) but I expected them to be able to sleep in them. I'm sure they aren't very breathable so I don't know how much they can actually be worn. They also say not to tumble dry! I refuse to buy kids/teen shirts that can't be dried so we'll soon find out how they hold up because I'm washing them now. :)
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