Ergonomic design: Fully fit the curve of the human cervical spine to ensure ahealthy head and neck, providing you with gentle support and high-qualitysleep.High elastic sponge and comfortable and silent: The 19 times high elasticsponge and 30D elastic fabric are not only quiet and comfortable, but alsoprotect your cervical spine, allowing you to enjoy a comfortable sleepingenvironment even when you are outdoors.