1. the height of the pillow to be compatible with the user's medical condition. 2. perception of pillows in different parts of hardness to sleep with a consumer needs to adapt to perceive hardness of different parts.
3. pillows in different parts of the perceived temperature to sleep with a consumer needs to adapt to perceived temperature of different parts.
4. the geometry of a pillow with the body is sleeping and sleeping state of head, neck, shoulders, adapted to the physiological feature of ear.
5. pillow pillowcase. Pillows and padding must be 100% natural eco-friendly materials,
6. pillow odour must be good and healthy and conducive to good sleep.