Comfortable Nap Time: Car seat pillows are mainly used to provide passengers with head and neck support when they fall asleep, thereby providing a more comfortable nap time. The side pillows of the headrest are filled with a soft and thick memory foam pad, which is sufficient as a cushion. The pillowcase is made of sponge cloth, which is comfortable and breathable, and easy to clean. Fits most cars with headrests (steering distance should be greater than 3.75 inches).