100% organic cotton Remember to follow washing and user instructions Head Circumference: 0-3 m: 41,5-43 cm3-6 m: 43-45 cm6-9 m: 45-48 cm9-12 m: 48-49 cm1-2 y: 49-50,5 cm3-4 y: 51-52 cm5-7 y: 52,5-53,5 cm