We have the technology. We can stretch them. We fulfilled our number one customer request and developed a way to create our awesome designs on stretchier socks. These babies can stretch up to 21 inches in circumference. These super hero socks come in our unisex STRETCH-IT size, so get ready to save babies and stop bicycle thieves once you put on these lightning bolts. Long live the Flash. 66% cotton, 32% polyester, 2% spandex. Made in Korea. Approximately fits up to women's shoe size 12 and men's shoe size 13.