Erupting volcanoes. Thunder and lightning. T Rex waiting behind every bend. Your child (age three to six) loves learning about beasts of the Jurassic, Triassic, and Cretacious because the dinosaur world was one of constant excitement. It would be great if they could feel that same sense of excitement when they are getting ready in the morning? Now they can with our awesome glow-in-the-dark Dinosaur Days Youth Crew Socks!64% Cotton / 31% Polyester / 3% Nylon / 2% Elastane. Made in Korea. These socks glow in the dark! Hold them up to light or walk outside in the sun before turning off the lights to watch the special thread glow. Our threads are certified by OEKO-TEX. Standard 100, which means we leave out harmful chemicals to keep your skin safe and happy.