NCAA Miami Infant One-Fit Hat wool Soft, Breathable, Cotton Construction, Perfect for the Littlest Fans. One-Fit Infant (Comfy, Flex Headband Fits Most Infants, Newborn to 18 months) Material: Cotton Premium quality fan gear manufactured by American-owned Top of the World. A terrific gift idea. Premium quality fan gear manufactured by American-owned Top of the World. A terrific gift idea.