The 100% cotton Fantastic Four Symbol Navy Tank Top is a classic navy tank top featuring the symbol of Marvel's First Family, The Fantastic Four! I guess we could say that we shot some regular tank tops into space that happened to be exposed to some very special cosmic radiation. They returned to us as the Fantastic Four Symbol Navy Tank Top! Hey, maybe when they say '100% cotton' they really mean Unstable Molecules! They probably aren't allowed to put that on the tag.