Cover: 80% cotton, 20% polyester (washable) Cushion: 100% polyether foam (not washable) Can be used in a stroller, and helps prevent flat head by allowing for longer sleep! Fine high-quality combed cotton It has a luster, a moist feel, is soft and warm. It has excellent breathability and evenly dissipates heat from the surface. It is not stuffy, so your child can sleep with peace of mind. The pillow's indentation evenly cradles the head, promoting good head shape. A baby's head bones are soft during the growth period, with gaps between the bones, making them prone to deformation. Because they cannot exert force on their neck on their own, they tend to tilt towards the heavier part of their head. This positional habit causes flat head and slanting head. The indentation of the pillow evenly cradles the head, preventing positional habits and stiff necks. An ergonomic pillow designed to be gentle on the head Stiff neck prevention area: The 5cm thick protrusions on both sides prevent stiff necks and face-down positional habits. Fontanelle protection area: Conforms to the curve from the top of the head to the back of the head, cradling the head and distributing pressure. Neck and shoulder protection area: The height is suitable for infants' heads and necks, fitting without putting a strain on the cervical spine, and the shape that matches the roundness of the shoulders encourages turning over. Pressure distribution area: The shape that suits infants' heads evenly cradles the head even when turned to the sides, evenly distributing pressure. This prevents flat head and slanting head. Concealed zipper: The zipper does not come into contact with the skin of the face or head, preventing hair friction and injuries. Reduced risk of suffocation: Memory foam maintains the contact surface without applying pressure, is soft and elastic, and does not impede blood flow. 9 holes provide good ventilation and reduce the risk of suffocation. Recommended by pediatric nurses Babies have large heads compared to their bodies, thick necks, and a large proportion of their tongue in their mouths, making them prone to upper airway obstruction. The indentation of the pillow allows the head and neck to be at a natural height, making breathing easier and reducing the risk. Even for babies who move a lot during sleep, the protrusions on both sides act as walls, making it less likely to cause a stiff neck, and the good breathability reduces the risk of suffocation. An infant's skull is soft during the growth period, and the bones are not firmly fixed, making them prone to deformation. The large fontanelle on the forehead closes around 1.5 years old, and the small fontanelle at the back closes around 3 months old, so it's especially important to protect the head until then. It has a shape that suits infants' heads and gently holds them, helping to develop a round head, so you can rest assured.