We all sleep better when it's dark. The top side of this comfortable sleep mask is blue Superman cotton flannel, the back side is your choice of soft black fleece, soft blue cotton flannel or smooth black satin. Inside is a dark layer to block light. The soft, wide elastic is black, shiny on one side. Pattern placement will vary. Large adult size: Mask is about 8 inches by 3inches from center. Elastic measures 13.5 inches. Fits a head about 22.5 to 24 inches. Average adult/teen size: About 8in (20cm) by 3in (7.5cm). Elastic measures about 12.5 in (32cm). Fits a head about 21 to 23 inches. Older child size: About 7.5 in by 2.5 in. Elastic measures about 12 in. Fits a head about 20-21.5 inches. Toddler/small child size: About 7 in by 2 in from center. Elastic is about 11.5 inches. Fits a head about 19-20 inches. Soft and comfy, carefully handmade in the USA. Product is legally handmade with licensed Marvel Comics material and is not a licensed product from either, nor is onetwothreejump in any way affiliated with Marvel Comics.