gongzhumama Baby Girl's Sun Hat with Hair Bow Sun Protection Main ingredient:100% cotton,Auxiliary material: Polyster.Hand wash The hat fits 19-19.6 inch head circumference (about10-24months) Babies have sensitive skin and sensitive eyes, a brimmed hat could ensure they are properly protected from the sun while playing outdoors Soft and breathable material,designed by Korea The strap is LONG enough to fumble a bowknot if it is big for your baby. After you feel it fits well for your baby, you could do not need fumble a bowknot.It is elastic stretch strap, but it is not adjustable, very soft .