Black & Yellow Buffalo Plaid Sleep Eye Mask Sleep better with a soft, dark sleep mask! The top side of this comfortable mask is a yellow and black buffalo plaid cotton flannel, the back side is your choice of soft black fleece, the same yellow and black cotton flannel or smooth black satin. (The flannel back might be a better choice for those to tend to get warm when they sleep.) Inside is a hidden layer to help to block out light. The black elastic band is shiny on the inside. 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.