Keep that little noggin protected and stylish. Cozy black velveteen with tiny white dots. Can be worn with brim turned up or left down. Fully lined. Size small fits heads about 19.5 inches/50 centimeters, which is kids about 18 months to 4 years. Size medium fits heads about 21 inches/53.3 centimeters, which is kids about ages 4 to 10. Please note that kids' head sizes vary a lot, so age ranges are only estimates.