Did you know that the Earth carries less than 1% of our solar system's mass. That's one massive solar system. Thankfully, we made these knee high socks out of our usual cotton/polyester blend; it should make walking much easier. 72% Cotton, 27% Polyester, 1% Spandex. Made in Korea. Our threads are certified by OEKO-TEX Standard 100, which means we leave out harmful chemicals to keep your skin safe and happy. Approximately fits children ages 7-10, shoe size 1-5.