?? I combine shipping. If you order multiple items at the same time, I will automatically refund you the excess shipping fee you have paid. Thank you. ?? ? Breathable cotton material that are Good for all seasons to block the sun for toddlers! ? For 1-4 years old children in general. ? Inside crown measurement is about 19" (48.20 cm) ? I would say measure child's head (crown) and make sure it doesn't exceed 20 inches. ? Chin-strap ensures hat stays put. ? Wash by hand in warm water. Shape the hat out and let it air dry. ? Material: Cotton ? So far we have only one size and sorry we don't take customization at this point.