Waterproof effectAll head circumference parts are made of silica gel, elastic, soft and comfortable, and waterproof effect is super.Adjustable head circumference size, This product uses a Velcro to adjust the size,Latest product design.Head circumference can be used above 15 inches,Suitable for head size : 15-24in(38-60cm)Ideal Use is for preventing water, soap, shampoo, hair clippings, away from the eyes and face.Give your child the best giftWearing method:Drying hair is wearing a shower cap,Because silicone itself is flexible, be sure to tighten.Angle is inclined 35-45 degrees, the soft part of the hat is close to the skin, do not mix the hair, then fasten it to rinse