LINKEY Baby Cotton Sun Protect Crab Wharf Bucket Hat With Air Holes Chin Strap Air holes for added ventilation and soft packable fabric. It has adjustable chin straps that tie under the neck to avoid the hat being blowen away. The hat is beautiful, amazing quality,very durable,bendable,so washing and packing/portability are easy. It can be use for the sun protection,keeps your baby's head nice and warm, it can be worn all the year round. Suitable Head Circumference from 17.7inches-20.8inches. Suitable Age from 1-6 years old. Please measure child's head circumference for more accurate sizing. Hand wash dry flat do not bleach.