100% cotton I'm selling this because my child has outgrown it. I purchased this at a store and kept it in a change-of-clothes bag. I believe it's unused, but there might be traces of a name sticker on the washing tag. I checked for other issues and found no stains, but please forgive any oversights. I'm also selling other 100cm innerwear and clothes. Please read my profile. UNIQLO undershirt inner white