100% Cotton 1.The baby boy girl socks is comfortable and breathable, good for baby's skin. 2.This sock is suitable for 0-18Month babies to wear every day. 3.They are excellent for use in nurseries, baptism,christening,kindergartens and indoor playgrounds。 4.Washing instructions: Gentle machine or hand washable at Max 40℃(104℉). Better to wash separately from other color clothes