Sometimes simple works best - and that's certainly true when it comes to this sleep cap. The front panel is cotton and the back panel is a soft stretch knit. Made from 100% cotton and 95% cotton/5% Lycra stretch knit. This cap measures 7 1/2 inches high and 19 inches in circumference. It will fit most children between the ages of 2 - 5 years old. If you need this cap bigger or smaller, please let me know. If you send me a measurement of the child's head (measure all the way around at forehead level), I'll be glad to make it to size. Also available in adult sizes 21 - 22 1/2 inch circumference. Washer/dryer safe (wash in cold water, dry on low heat to avoid shrinking).