Friendly Customer Service: If you have any question, please contact us we will do our best to solve the problem. Material: Made of EVA natural resin, soft and light, can prevent from scratching baby's head effectively. Adjustable size: There are 4 buttons can be resized. Cap's outer ring: about 29.5*31*0.3 cm/11.6* 12.2*0.12 inch. Head circumference: about 39 - 43 cm/ 15.3 - 16.9 inch. The inner diameter can be adjusted to 12.5 -14 cm/ 4.9 -5.5 inch. Please measure the baby's head circumference firstly. Function: Protects your baby or toddler's eyes, mouth and nose from shampoo and water. Your baby can open eyes and breathe freely while washing hair. Thick design: Shampoo cap thicken, making child feel soft and comfortable. Enough elasticity, will not be deformed after wearing, can be reused for a long time.