Easy to install:Put the padded part on the child's forehead after the child falls asleep, then attach the wrist strap with the car seat / stroller, undo: undo the Velcro. very easy~ What does it do?: These are belts that are placed on children's heads to hold their heads when they sleep in the car and thus prevent their heads from going forwards and even to the sides. Very comfortable : Made of organic cotton, handmade and comfortable for your baby, it is a protective accessory for your baby's head during sudden movements in the car, resting or sleeping. Suitable to all babies:Adjustable plastic buckle with elastic to fit all head sizes. Super useful and very durable. Adjustable length, suitable for all baby / child seats. Easy to clean: Can be washed by hand or machine.