Nicky Bigs Novelties ™ Yellow Plastic Construction Hard Helmet This plastic toy helmet is made of thick durable material. The interior has an adjustable suspension to allow the helmet to fit many head sizes. The adjustable size allows up to 58.5 cm circumference or approximately 23 inches. The adjustment can be set to fit the smallest of head sizes however we recommend this helmet for ages 3 and up. Size: One Size Fits Most Child and some Adults Perfect for pretend play, Halloween, Costume Parties, or getting wacky.