[Size]: The cap circumference is approximately 52-56 cm. (20.47-22.04 inches). We recommend it for children 2-6 years old. The recommended age is for reference only. The chin strap can be adjusted and removed for easy storage. [Skin-friendly material]: The summer hat for children is made of high quality polyester fiber + cotton material, which has good breathability and shading, and is comfortable and soft. [grid design]: The mesh fabric on both sides of the top of the hat is very breathable and can dissipate heat over time. The texture is soft, can be folded and simply put in a small backpack. [Neck protection]: Specially developed for sun protection. The extra wide edge and the soft tail material protect the baby from the sun in every way. It is convenient for everyday use, for walks on the beach and other outdoor activities. [Cleaning]: We recommend hand washing the cap and hanging it dry. Very suitable for beaches, swimming pools and other sports.