Find out what happens when worlds collide with this officially licensed The Flash Worlds Collide 5-Pair Pack of Ankle Socks. This awesome Flash Sock Set comes with five pairs of Flash Worlds Collide Ankle Socks that are made from a poly-spandex blended fabric that provides feet with flexibility and extra comfort. Machine wash cold with like colors, do not bleach, tumble dry with low heat. Packaging: Custom hanging header card.