60%cotton Imported Universal Size - This high elastic warmer LED knit hats fit wide range of head sizes for most boys, girls, men and women. Material Feature - Acrylic Christmas Hat is really soft, has better heat retention and good elasticity, suit for indoor and outdoor. Double layer winter knit christmas beanie hat, skin-friendly.Please DON'T washed derictly,it will damage the battery. Easy to Use - 6 colorful LED flashing lights powered by 2 * CR2032 lithium coin cell batteries (included). Turning switch to "ON" position to activate the lights. 36 hours of running time. Suit Occassion - The novelty hat suit for Christmas party,music festival Party,birthday party,bar gathering,great gift for your family,friends Batteries are included. Normally, the batteries can last for more than 36 hours.