This LED light up knitted hats are made of quality acrylic, it is soft and warm to touch. turn up cuff and tasselled pom-pom top, hinting at your playful personality. stretchy 90% acrylic & 10% spandex conforms to snugly fit many noggin shapes and sizes. it\'s an acrylic knit so it\'s super warm, perfect for topping off your best cold weather get up! Complies with Prop 65. 11" H x 8.3" W